preferred_name: a purine nucleobase + alpha-D-ribose 1-phosphate => a purine D-ribonucleoside + phosphate
preferred_name_lc: a purine nucleobase + alpha-d-ribose 1-phosphate => a purine d-ribonucleoside + phosphate
label: a purine nucleobase + alpha-D-ribose 1-phosphate => a purine D-ribonucleoside + phosphate
label_lc: a purine nucleobase + alpha-d-ribose 1-phosphate => a purine d-ribonucleoside + phosphate