5'-end phospho-adenosine-phospho-ribonucleoside(3-) residue
5'-end phospho-adenosine-phospho-ribonucleoside(3-) residue
An organic anionic group obtained by deprotonation of the phosphate OH groups of a 5'-end phospho-adenosine residue followed by any ribonucleotide; major species at pH 7.3.