vitamin B5

Any member of a group of vitamers that belong to the chemical structural class called pantothenic acids that exhibit biological activity against vitamin B5 deficiency. Deficiency of vitamin B5 is rare due to its widespread distribution in whole grain cereals, legumes and meat. Symptoms associated with vitamin B5 deficiency are difficult to asses since they are subtle and resemble those of other B vitamin deficiencies. The vitamers include (R)-pantothenic acid and its ionized and salt forms.


cyanides

Salts and C-organyl derivatives of hydrogen cyanide, HC#N.


alanine derivative

An amino acid derivative resulting from reaction of alanine at the amino group or the carboxy group, or from the replacement of any hydrogen of alanine by a heteroatom. The definition normally excludes peptides containing alanine residues.


vitamin B7

Any member of a group of vitamers that belong to the chemical structural class called biotins that exhibit biological activity against vitamin B7 deficiency. Vitamin B7 deficiency is very rare in individuals who take a normal balanced diet. Foods rich in biotin are egg yolk, liver, cereals, vegetables (spinach, mushrooms) and rice. Symptoms associated with vitamin B7 deficiency include thinning hair, scaly skin rashes around eyes, nose and mouth, and brittle nails. The vitamers include biotin and its ionized and salt forms.


L-proline derivative

A proteinogenic amino acid derivative resulting from reaction of L-proline at the amino group or the carboxy group, or from the replacement of any hydrogen of L-proline  by a heteroatom.


azobenzenes

Any member of the wide class of molecules that share the core azobenzene structure, comprising two phenyl rings linked by a N=N double bond, which may have different functional groups extending from the rings.


monoamine molecular messenger

A group of neurotransmitters and neuromodulators that contain one amino group that is connected to an aromatic ring by ethylene group  (-CH2-CH2-). Monoamines are derived from the aromatic amino acids phenylalanine, tyrosine, histidine and tryptophan.


organophosphorus compound

An organophosphorus compound is formally a compound containing at least one carbon-phosphorus bond, but the term is often extended to include esters and thioesters.


proline derivative

An amino acid derivative resulting from reaction of proline at the amino group or the carboxy group, or from the replacement of any hydrogen of proline by a heteroatom. The definition normally excludes peptides containing proline residues.


peptide hormone

Any peptide with hormonal activity in animals, whether endocrine, neuroendocrine, or paracrine.


diamine

Any polyamine that contains two amino groups.


glutamic acid derivative

An amino acid derivative resulting from reaction of glutamic acid at the amino group or either of the carboxy groups, or from the replacement of any hydrogen by a heteroatom. The definition normally excludes peptides containing glutamic acid residues.


dicarboximide

An imide in which the two acyl substituents on nitrogen are carboacyl groups.


aromatic amine

An amino compound in which the amino group is linked directly to an aromatic system.


ethylenediamine derivative

Any organic amino compound that is a derivative of  ethylenediamine.


phenylalanine derivative

An amino acid derivative resulting from reaction of alanine at the amino group or the carboxy group, or from the replacement of any hydrogen of phenylalanine  by a heteroatom. The definition normally excludes peptides containing phenylalanine  residues.


nitroso compound

Compounds having the nitroso group, -NO, attached to carbon, or to another element, most commonly nitrogen or oxygen.


DL-Pantothenic acid

A member of the class of pantothenic acids that is an amide formed from pantoic acid and beta-alanine.


hydrazines

Hydrazine (diazane) and its substituted derivatives.


tryptophan derivative

An amino acid derivative resulting from reaction of tryptophan  at the amino group or the carboxy group, or from the replacement of any hydrogen of tryptophan  by a heteroatom. The definition normally excludes peptides containing tryptophan residues.


C-nitro compound

A nitro compound having the nitro group (-NO2) attached to a carbon atom.


guanidines

Any organonitrogen compound containing a carbamimidamido (guanidino) group. Guanidines have the general structure (R(1)R(2)N)(R(3)R(4)N)C=N-R(5) and are related structurally to amidines and ureas.


secondary carboxamide

A carboxamide resulting from the formal condensation of a carboxylic acid with a primary amine; formula RC(=O)NHR(1).


tyrosine derivative

An amino acid derivative resulting from reaction of tyrosine at the amino group or the carboxy group, any substitution of phenyl hydrogens, or from the replacement of any hydrogen of tyrosine by a heteroatom. The definition normally excludes peptides containing tyrosine residues.


biguanides

A class of oral hypoglycemic drugs used for diabetes mellitus or prediabetes treatment. They have a structure based on the 2-carbamimidoylguanidine skeleton.


proteinogenic amino acid derivative

Any derivative of a proteinogenic amino acid resulting from reaction at an amino group, carboxy group, or a side-chain functional group, or from the replacement of any hydrogen by a heteroatom.


serine derivative

An amino acid derivative resulting from reaction of serine at the amino group or the carboxy group, or from the replacement of any hydrogen of serine by a heteroatom. The definition normally excludes peptides containing serine residues.


peptide antibiotic

A chemically diverse class of peptides that exhibit antimicrobial properties.


aromatic amide

An amide in which the amide linkage is bonded directly to an aromatic system.


secondary amino compound

A compound formally derived from ammonia by replacing two hydrogen atoms by organyl groups.


anilide

Any aromatic amide obtained by acylation of aniline.


secondary amide

A derivative of two oxoacids RkE(=O)l(OH)m (l =/= 0) in which two acyl groups are attached to the amino or substituted amino group.


L-glutamic acid derivative

A proteinogenic amino acid derivative resulting from reaction of L-glutamic acid at the amino group or either of the carboxy groups, or from the replacement of any hydrogen of L-glutamic acid by a heteroatom.


N-acylurea

A member of the class of ureas that has the general formula R-CO-NH-CO-NH2 or R-CO-NH-CO-NH-CO-R', formally derived by the acylation of one or both of the nitrogens of a urea moiety.


non-proteinogenic amino acid derivative

Any derivative of a non-proteinogenic amino acid resulting from reaction at an amino group or carboxy group, or from the replacement of any hydrogen by a heteroatom.


hydroxamic acid ester

A carboxamide that is a hydroxamic acid in which the hydrogen of the hydroxy group is replaced by an organyl group.


aralkylamino compound

An organic amino compound in which an aminoalkyl group is linked to an arene.


actinomycin

A large group of antibiotics isolated from various species of Streptomyces and characterised by having a substituted phenoxazine ring linked to two cyclic heterodetic peptides.


nitro compound

A compound having a nitro group, -NO2 (free valence on nitrogen), which may be attached to carbon, nitrogen (as in nitramines), or oxygen (as in nitrates), among other elements (in the absence of specification, C-nitro compounds are usually implied).


L-alanine derivative

A proteinogenic amino acid derivative resulting from reaction of L-alanine at the amino group or the carboxy group, or from the replacement of any hydrogen of L-alanine by a heteroatom.


thiocarboxamide

Any primary amide having its amide oxygen replaced by sulfur.


alpha,beta-unsaturated carboxylic acid amide

A monocarboxylic amide of general formula R(1)R(2)C=CR(3)-C(=O)NR(4)R(5)  or R(1)C#C-C(=O)NR(2)R(3) in which the amide C=O function is conjugated to an unsaturated C-C bond at the alpha,beta position.


1,1-bis(phosphonic acid)

Any member of the class of phosphonic acids in which a carbon atom is directly attached to two phosphonic acid groups. They are analogues of pyrophosphates (with the central oxygen atom replaced by a carbon atom) and like pyrophosphates they tend to have a strong affinity for bone, so are frequently used for their antiresorptive and hypocalcaemic properties.


N-acylglutamic acid

A glutamic acid derivative that is glutamic acid in which a hydrogen attached to the nitrogen has been replaced by an acyl group.


histidine derivative

An amino acid derivative resulting from reaction of histidine at the amino group or the carboxy group, or from the replacement of any hydrogen of histidine by a heteroatom. The definition normally excludes peptides containing alanine residues.


methoxybenzenes

Any aromatic ether that consists of a benzene skeleton substituted with one or more methoxy groups.


dimethoxybenzene

Any methoxybenzene that consists of a benzene skeleton substituted with two methoxy groups and its derivatives.


ester

A compound formally derived from an oxoacid RkE(=O)l(OH)m (l > 0) and an alcohol, phenol, heteroarenol, or enol by linking with formal loss of water from an acidic hydroxy group of the former and a hydroxy group of the latter.


sultone

An intramolecular cyclic ester of a hydroxy sulfonic acid, analogous to lactone.


aromatic ester

An ester where the ester linkage is bonded directly to an aromatic system.


carbonates

Organooxygen compounds that are salts or esters of carbonic acid, H2CO3.


biphenyls

Benzenoid aromatic compounds containing two phenyl or substituted-phenyl groups which are joined together by a single bond.


benzenes

Any benzenoid aromatic compound consisting of the benzene skeleton and its substituted derivatives.


tetracenes

Compounds containing a tetracene skeleton.


alkenylbenzene

A member of the class of benzenes that is benzene substituted with one or more alkenyl groups. It is a group of naturally occurring compounds that are synthesized as secondary metabolites in various plants, including nutmeg and basil.


toluenes

Any member of the class of benzenes that is a substituted benzene in which the substituents include one (and only one) methyl group.


acenes

Polycyclic aromatic hydrocarbons consisting of fused benzene rings in a rectilinear arrangement and their substitution derivatives.


carbohydrates and carbohydrate derivatives

Any organooxygen compound that is a polyhydroxy-aldehyde or -ketone, or a compound derived from one. Carbohydrates contain only carbon, hydrogen and oxygen and usually have an empirical formula Cm(H2O)n; carbohydrate derivatives may contain other elements by substitution or condensation.


monosaccharide

Parent monosaccharides are polyhydroxy aldehydes H[CH(OH)]nC(=O)H or polyhydroxy ketones H-[CHOH]n-C(=O)[CHOH]m-H with three or more carbon atoms. The generic term 'monosaccharide' (as opposed to oligosaccharide or polysaccharide) denotes a single unit, without glycosidic connection to other such units. It includes aldoses, dialdoses, aldoketoses, ketoses and diketoses, as well as deoxy sugars, provided that the parent compound has a (potential) carbonyl group.


Kombetin

A glycosyl compound resulting from the attachment of a glycosyl group to a non-acyl group RO-, RS-, RSe-, etc. The bond between the glycosyl group and the non-acyl group is called a glycosidic bond. By extension, the terms N-glycosides and C-glycosides are used as class names for glycosylamines and for compounds having a glycosyl group attached to a hydrocarbyl group respectively. These terms are misnomers and should not be used. The preferred terms are glycosylamines and C-glycosyl compounds, respectively.


An aldohexose that is the C-4 epimer of glucose.


oligosaccharide derivative

A carbohydrate derivative that is formally obtained from an oligosaccharide.


amino monosaccharide

Any  amino sugar that is a monosaccharide in which one alcoholic hydroxy group is replaced by an amino group.


A linear tetrasaccharide comprising three L-glycero-alpha-D-manno-heptose residues and a 3-deoxy-alpha-D-manno-oct-2-ulosonic acid (2-keto-3-deoxy-alpha-D-mannooctanoic acid, alpha-Kdo) residue in a (1->7), (1->3), (1->5) sequence.


carbohydrate acid derivative

A carbohydrate derivative that is formally obtained from a carbohydrate acid.


aureolic acid

Glycoside compounds that have a 1-keto-8,9-dihydroxyanthracene skeleton, a functionalized alkyl chain at the 3- position, and two oligosaccharide chains of variable lengths.


D-aldohexose

Any D-aldose having a chain of six carbon atoms in the molecule.


oligosaccharide

A compound in which monosaccharide units are joined by glycosidic linkages. The term is commonly used to refer to a defined structure as opposed to a polymer of unspecified length or a homologous mixture. When the linkages are of other types the compounds are regarded as oligosaccharide analogues.


D-glucoside

Any glucoside in which the glycoside group is derived from D-glucose.


carbohydrate

Any member of the class of organooxygen compounds that is a polyhydroxy-aldehyde or -ketone or a lactol resulting from their intramolecular condensation (monosaccharides); substances derived from these by reduction of the carbonyl group (alditols), by oxidation of one or more hydroxy groups to afford the corresponding aldehydes, ketones, or carboxylic acids, or by replacement of one or more hydroxy group(s) by a hydrogen atom; and polymeric products arising by intermolecular acetal formation between two or more such molecules (disaccharides, polysaccharides and oligosaccharides). Carbohydrates contain only carbon, hydrogen and oxygen atoms; prior to any oxidation or reduction, most have the empirical formula Cm(H2O)n. Compounds obtained from carbohydrates by substitution, etc., are known as carbohydrate derivatives and may contain other elements. Cyclitols are generally not regarded as carbohydrates.


glycosyl compound

A carbohydrate derivative arising formally from the elimination of water from a glycosidic hydroxy group and an H atom bound to an oxygen, carbon, nitrogen or sulfur atom of a separate entity.


trisaccharide derivative

An oligosaccharide derivative that is formally obtained from a trisaccharide.


D-fructose

Fructose is a levorotatory monosaccharide and an isomer of glucose.  Although fructose is a hexose (6 carbon sugar), it generally exists as a 5-member hemiketal ring (a furanose).


aldohexose

A hexose with a (potential) aldehyde group at one end.


aldose

Aldehydic parent sugars (polyhydroxy aldehydes H[CH(OH)]nC(=O)H, n >= 2) and their intramolecular hemiacetals.


beta-D-glucoside

Any D-glucoside in which the anomeric centre has beta-configuration.


disaccharide derivative

A carbohydrate derivative that is formally obtained from a disaccharide.


ketohexose

Any hexose containing a single ketone group.


saponin

A glycoside that is a compound containing one or more hydrophilic glycoside moieties combined with a lipophilic triterpenoid or steroid derivative. Found in particular abundance in plant species.


D-(-)-Fructose

The open-chain form of D-fructose.


beta-D-Glucosamine

A 2-amino-2-deoxy-D-glucopyranose that is D-glucosamine having a beta-configuration at the anomeric position.


tetrasaccharide derivative

An oligosaccharide derivative that is formally obtained from a tetrasaccharide.


tetrasaccharide

An oligosaccharide comprising four monomeric monosaccharide units.


carbohydrate-containing antibiotic

Any carbohydrate derivative that exhibits antibiotic activity.


glucosamines

Any  hexosamine that is glucose in which at least one of the hydroxy groups has been replaced by an amino group.


alditol derivative

A carbohydrate derivative that is formally obtained from an alditol.


beta-glucoside

A glucoside in which the anomeric carbon of the glycosidic bond is in a beta configuration


pentasaccharide derivative

An oligosaccharide derivative that is formally obtained from a pentasaccharide.


galactopyranose

The pyranose form of galactose.


D-fructofuranose

A fructofuranose that has D configuration.


amino sugar

Any sugar having one or more alcoholic hydroxy groups replaced by substituted or unsubstituted amino groups.


hexitol derivative

An alditol derivative that is formally obtained from a hexitol.


glucosiduronic acid

Any substance produced by linking glucuronic acid to another substance via a glycosidic bond.


alpha-GLUCOSAMINE, D-

A 2-amino-2-deoxy-D-glucopyranose with an alpha-configuration at the anomeric position.


glycan

Any oligosaccharide, polysaccharide or their derivatives consisting of monosaccharides or monosaccharide derivatives linked by glycosidic bonds. See also http://www.ontobee.org/ontology/GNO?iri=http://purl.obolibrary.org/obo/GNO_00000001.


C-glycosyl compound

A glycosyl compound arising formally from the elimination of water from a glycosidic hydroxy group and an H atom bound to a carbon atom, thus creating a C-C bond.


carbohydrate derivative

Any organooxygen compound derived from a carbohydrate by replacement of one or more hydroxy group(s) by an amino group, a thiol group or similar heteroatomic groups. The term also includes derivatives of these compounds.


D-hexose

A hexose that has D-configuration at position 5.


The open-chain form of D-glucosamine.


hexose

Any six-carbon monosaccharide which in its linear form contains either an aldehyde group at position 1 (aldohexose) or a ketone group at position 2 (ketohexose).


ketose

Ketonic parent sugars (polyhydroxy ketones H[CH(OH)]nC(=O)[CH(OH)]mH) and their intramolecular hemiketals.


beta-D-galactoside

Any D-galactoside having beta-configuration at its anomeric centre.


glycosyloxyflavone

A member of the class of flavones having one or more glycosyl residues attached at unspecified positions.


glucitol derivative

A hexitol derivative that is formally obtained from a glucitol.


quercetin O-glycoside

Any glycosyloxyflavone that is an O-glycosylated derivative of quercetin.


D-glucosamine

An amino sugar whose structure comprises D-glucose having an amino substituent at position 2.


olefinic compound

Any organic molecular entity that contains at least one C=C bond.


enyne

An  acetylenic and an olefinic  compound containing a carbon chain that contains a carbon-carbon double bond and a carbon-carbon triple bond.


phenylpropanoid

Any organic aromatic compound with a structure based on a phenylpropane skeleton. The class includes naturally occurring phenylpropanoid esters, flavonoids, anthocyanins, coumarins and many small phenolic molecules as well as their semi-synthetic and synthetic analogues. Phenylpropanoids are also precursors of lignin.


lignan

Any phenylpropanoid  derived from phenylalanine via dimerization of substituted cinnamic alcohols, known as monolignols, to a dibenzylbutane skeleton. Note that while individual members of the class have names ending ...lignane, ...lignene, ...lignadiene, etc., the class names lignan, neolignan, etc., do not end with an "e".


acetylenic compound

Any organic molecule containing a C#C bond.


terminal acetylenic compound

An acetylenic compound which a carbon of the C#C moiety is attached to a hydrogen atom.


tetracyclines

A subclass of polyketides having an octahydrotetracene-2-carboxamide skeleton, substituted with many hydroxy and other groups.


antibiotic fungicide

Any antibiotic antifungal agent that has been used as a fungicide.


decaketide

Decaketides are polyketide compounds that are synthesized from ten ketide units. They are derivatives of a 20-carbon skeleton.


transition element molecular entity

A molecular entity containing one or more atoms of a transition element.


organomercury compound

A compound containing at least one carbon-mercury bond.


zinc oxide nanotube

A nanotube consisting of zinc oxide.


zinc oxide nanorod

A nanorod composed of zinc oxide.


d-block molecular entity

A d-block molecular entity is a molecular entity containing one or more atoms of a d-block element.


zinc oxide nanoparticle

A nanoparticle consisting of zinc oxide.


f-block molecular entity

A molecular entity containing one or more atoms of an f-block element.


organic molecular entity

Any molecular entity that contains carbon.


one-carbon compound

An organic molecular entity containing a single carbon atom (C1).


ether

An organooxygen compound with formula ROR, where R is not hydrogen.


organic molecule

Any molecule that consists of at least one carbon atom as part of the electrically neutral entity.


diether

A polyether in which the number of ether linkages is 2.


monomethoxyflavone

Any methoxyflavone with a single methoxy substituent.


organometallic compound

A compound having bonds between one or more metal atoms and one or more carbon atoms of an organyl group.


semisynthetic derivative

Any organic molecular entity derived from a natural product by partial chemical synthesis.


anthoxanthin

are a type of flavonoid pigments in plants. Anthoxanthins are water-soluble pigments which range in color from white or colorless to a creamy to yellow, often on petals of flowers.


cyclopropanes

Cyclopropane and its derivatives formed by substitution.


benzyl ether

A compound of formula PhCH2OR (R =/= H).


statin (naturally occurring)

Any statin that occurs in nature. The class includes compactin (also known as mevastatin), isolated from a fermentation broth of Penicillium citrinum, and lovastatin, isolated from Aspergillus terreus.


antibiotic antifungal agent

Heteroorganic entities that are microbial metabolites (or compounds derived from them) which have significant antifungal properties.


methoxyflavone

Any member of the class of flavones with at least one methoxy substituent.


heteroorganic entity

A heteroorganic entity is an organic molecular entity in which carbon atoms or organic groups are bonded directly to one or more heteroatoms.


lipid

'Lipids' is a loosely defined term for substances of biological origin that are soluble in nonpolar solvents. They consist of saponifiable lipids, such as glycerides (fats and oils) and phospholipids, as well as nonsaponifiable lipids, principally steroids.


organoboron compound

A compound containing at least one carbon-boron bond.


acetal

An organooxygen compound having the structure RR'C(OR'')(OR''') (R'', R''' =/= H). Mixed acetals have R'' and R''' groups which differ.


bridged diphenyl antifungal agent

Any organic aromatic compound containing two phenyl (or substituted phenyl) groups attached to a single carbon or heteroatom and which has significant antifungal properties.


poly(ethylene glycol) derivative

A polyether that is any poly(ethylene glycol) in which one or both of the terminal hydroxy groups has been substituted or undergone modification.


aromatic ether

Any ether in which the oxygen is attached to at least one aryl substituent.


flavones

A member of the class of flavonoid with a 2-aryl-1-benzopyran-4-one (2-arylchromen-4-one) skeleton and its substituted derivatives.


polyether

Any ether that contains more than one ether linkage.


meroterpenoid

Meroterpenoids are complex organooxygen natural products produced from polyketide and terpenoid precursors.


carbocyclic compound

A homocyclic compound in which all of the ring members are carbon atoms.


statin (synthetic)

A statin which does not occur naturally and which is not obtained by chemical transformation of a naturally occurring statin.


flavonoid

Any member of the 'superclass' flavonoids whose skeleton is based on 1-benzopyran with an aryl substituent at position 2. The term was originally restricted to natural products, but is now also used to describe semi-synthetic and fully synthetic compounds.


tetracenomycin

A polyketide based on a tetracene ring structure.


bridged diphenyl fungicide

Any organic aromatic compound containing two phenyl (or substituted phenyl) groups attached to a single carbon or heteroatom and which has been used as a fungicide.


ketal

An acetal of formula R2C(OR)2 (R =/= H) derived from a ketone by replacement of the oxo group by two hydrocarbyloxy groups. The class name 'ketals', once abandoned by IUPAC, has been reinstated as a subclass of acetals.


organic cyclic compound

Any organic molecule that consists of atoms connected in the form of a ring.


zwitterion

A neutral compound having formal unit electrical charges of opposite sign on non-adjacent atoms. Sometimes referred to as inner salts, dipolar ions (a misnomer).


organochalcogen compound

An organochalcogen compound is a compound containing at least one carbon-chalcogen bond.


organooxygen compound

An organochalcogen compound containing at least one carbon-oxygen bond.


amino acid zwitterion

The zwitterionic form of an amino acid having a negatively charged carboxyl group and a positively charged amino group.


polyketide

Natural and synthetic compounds containing alternating carbonyl and methylene groups ('beta-polyketones'), biogenetically derived from repeated condensation of acetyl coenzyme A (via malonyl coenzyme A), and usually the compounds derived from them by further condensations, etc. Considered by many to be synonymous with the less frequently used terms acetogenins and ketides.


organic acid

Any organic molecular entity that is acidic and contains carbon in covalent linkage.


dipolar compound

An  organic molecule that is electrically neutral carrying a positive and a negative charge in one of its major canonical descriptions. In most dipolar compounds the charges are delocalized; however the term is also applied to species where this is not the case.


fatty acid derivative

Any organic molecular entity derived from a fatty acid.


organic cation

Any organic ion with a net positive charge.


cyclopentanes

Cyclopentane and its derivatives formed by substitution.


biaryl

An organic aromatic compound whose structure contains two aromatic rings or ring systems, joined to each other by a single bond.


antibiotic antifungal drug

Any antibiotic antifungal agent used to treat fungal infections in humans or animals.


An amino acid zwitterion obtained by transfer of a proton from the carboxy to the amino group of tryptophan; major species at pH 7.3.


bridged diphenyl antifungal drug

Any bridged diphenyl antifungal agent used for the treatment of fungal infections in humans or animals.


cyclobutanes

Cyclobutane and its derivatives formed by substitution.


statin

Any organooxygen compound whose structure is related to compactin (mevastatin) and which may be used as an anticholesteremic drug due its EC 1.1.1.34/EC 1.1.1.88 (hydroxymethylglutaryl-CoA reductase) inhibitory properties.


flavonoids

Any organic molecular entity whose stucture is based on derivatives of a phenyl-substituted 1-phenylpropane possessing a C15 or C16 skeleton, or such a structure which is condensed with a C6-C3 lignan precursors. The term is a 'superclass' comprising all members of the classes of flavonoid, isoflavonoid, neoflavonoid, chalcones, dihydrochalcones, aurones, pterocarpan, coumestans, rotenoid, flavonolignan, homoflavonoid and flavonoid oligomers. Originally restricted to natural products, the term is also applied to synthetic compounds related to them.


reactive oxygen species

Molecules or ions formed by the incomplete one-electron reduction of oxygen. They contribute to the microbicidal activity of phagocytes, regulation of signal transduction and gene expression, and the oxidative damage to biopolymers.


elemental molecular entity

A molecular entity all atoms of which have the same atomic number.


elemental molecule

A molecule all atoms of which have the same atomic number.


radical

A molecular entity possessing an unpaired electron.


carbene

The electrically neutral species H2C(2.) and its derivatives, in which the carbon is covalently bonded to two univalent groups of any kind or a divalent group and bears two nonbonding electrons, which may be spin-paired (singlet state) or spin-non-paired (triplet state).


Carbenes containing an imidazol-2-ylidene skeleton.


cation

A monoatomic or polyatomic species having one or more elementary charges of the proton.


p-block molecular entity

A main group molecular entity that contains one or more atoms of a p-block element.


chalcogen molecular entity

Any p-block molecular entity containing a chalcogen.


selenites

Salts and esters of selenous acid.


gas molecular entity

Any main group molecular entity that is gaseous at standard temperature and pressure (STP; 0degreeC and 100 kPa).


oxygen-16 atom

The stable isotope of oxygen with relative atomic mass 15.994914. The most abundant (99.76 atom percent) isotope of naturally occurring oxygen.


oxygen-15 atom

The radioactive isotope of oxygen with relative atomic mass 15.003065. The longest-lived oxygen radionuclide with half-life of 122.2 s.


sulfur-35 atom

The radioactive isotope of sulfur with relative atomic mass 34.9690322 and nuclear spin (3)/2. The longest-lived sulfur radionuclide with half-life of 87.5 days.


iodine-127 atom

The stable isotope of iodine with relative atomic mass 126.904468, 100 atom percent natural abundance and nuclear spin 5/2.


CID 71309543

The stable isotope of sulfur with relative atomic mass 33.9678668 and 4.21 atom percent natural abundance.


sulfur-38 atom

The radioactive isotope of sulfur with relative atomic mass 37.97116 and half-life of 170.3 min.


CID 71309715

The stable isotope of sulfur with relative atomic mass 32.9714585, 0.75 atom percent natural abundance, and nuclear spin (3)/2.


CID 71311181

The stable isotope of sulfur with relative atomic mass 31.972071. The most abundant (95.02 atom percent) isotope of naturally occurring sulfur.


sulfur-36 atom

The stable isotope of sulfur with relative atomic mass 35.9670809. The least abundant (0.02 atom percent) isotope of naturally occurring sulfur.


iodine-129 atom

The isotope of iodine with relative atomic mass 128.904988, and nuclear spin 7/2.


ion

A molecular entity having a net electric charge.


anion

A monoatomic or polyatomic species having one or more elementary charges of the electron.


polyatomic ion

An ion consisting of more than one atom.


inherited disease susceptibility

biolink:Disease biolink:DiseaseOrPhenotypicFeature biolink:BiologicalEntity biolink:NamedThing biolink:Entity biolink:ThingWithTaxon

A latent susceptibility to disease at the genetic level, which may be activated under certain conditions.


aromatic compound

A cyclically conjugated molecular entity with a stability (due to delocalization) significantly greater than that of a hypothetical localized structure (e.g. Kekule structure) is said to possess aromatic character.


macrocycle

A cyclic compound containing nine or more atoms as part of the cyclic system.


chemical entity

A chemical entity is a physical entity of interest in chemistry including molecular entities, parts thereof, and chemical substances.


main group molecular entity

A molecular entity containing one or more atoms from any of groups 1, 2, 13, 14, 15, 16, 17, and 18 of the periodic table.


cyclic compound

Any molecule that consists of a series of atoms joined together to form a ring.


chemical substance

A chemical substance is a portion of matter of constant composition, composed of molecular entities of the same type or of different types.


heterocyclic compound

A cyclic compound having as ring members atoms of at least two different elements.


polyatomic entity

Any molecular entity consisting of more than one atom.


mineral

In general, a mineral is a chemical substance that is normally crystalline formed and has been formed as a result of geological processes. The term also includes metamict substances (naturally occurring, formerly crystalline substances whose crystallinity has been destroyed by ionising radiation) and can include naturally occurring amorphous substances that have never been crystalline ('mineraloids') such as georgite and calciouranoite as well as substances formed by the action of geological processes on bigenic compounds ('biogenic minerals').


inorganic molecular entity

A molecular entity that contains no carbon.


alkali metal molecular entity

A molecular entity containing one or more atoms of an alkali metal.


atom

A chemical entity constituting the smallest component of an element having the chemical properties of the element.


isotopically modified compound

Any molecular entity in which the isotopic ratio of nuclides for at least one element deviates measurably from that occurring in nature. The term includes both isotopically substituted compounds (in which essentially all the molecules of the compound have only the indicated nuclide(s) at each designated position) and isotopically labeled compounds (a formal mixture of an isotopically unmodified compound with one or more analogous isotopically substituted compound(s).


ring assembly

Two or more cyclic systems (single rings or fused systems) which are directly joined to each other by double or single bonds are named ring assemblies when the number of such direct ring junctions is one less than the number of cyclic systems involved.


mineral nutrient

A mineral that is an inorganic nutrient which must be ingested and absorbed in adequate amounts to satisfy a wide range of essential metabolic and/or structural functions in the human body.


pnictogen

Any p-block element atom that is in group 15 of the periodic table: nitrogen, phosphorus, arsenic, antimony and bismuth.


bicyclic compound

A molecule that features two fused rings.


mancude ring

Any molecular entity that consists of a ring having (formally) the maximum number of noncumulative double bonds.


p-block element atom

Any main group element atom belonging to the p-block of the periodic table.


molecule

Any polyatomic entity that is an electrically neutral entity consisting of more than one atom.


chalcogen

Any p-block element belonging to the group 16 family of the periodic table.


heterobicyclic compound

A bicyclic compound in which at least one of the rings contains at least one skeletal heteroatom.


s-block molecular entity

An s-block molecular entity is a molecular entity containing one or more atoms of an s-block element.


alkaline earth molecular entity

An alkaline earth molecular entity is a molecular entity containing one or more atoms of an alkaline earth metal.


main group element atom

An atom belonging to one of the main groups (found in the s- and p- blocks) of the periodic table.


homocyclic compound

A cyclic compound having as ring members atoms of the same element only.


molecular entity

Any constitutionally or isotopically distinct atom, molecule, ion, ion pair, radical, radical ion, complex, conformer etc., identifiable as a separately distinguishable entity.


(11)C-modified compound

An isotopically modified compound which contains one or more (11)C atoms. (11)C is the most stable artificial isotope of carbon, decaying by positron emission to (11)B with a half-life of 20.334 minutes.


disease susceptibility

A constitution or condition of the body which makes the tissues react in special ways to certain extrinsic stimuli and thus tends to make the individual more than usually susceptible to certain diseases.