preferred_name: a purine nucleobase + 2-deoxy-D-ribose 5-phosphate => a purine 2'-deoxyribonucleoside 5'-phosphate + H2O
preferred_name_lc: a purine nucleobase + 2-deoxy-d-ribose 5-phosphate => a purine 2'-deoxyribonucleoside 5'-phosphate + h2o
label: a purine nucleobase + 2-deoxy-D-ribose 5-phosphate => a purine 2'-deoxyribonucleoside 5'-phosphate + H2O
label_lc: a purine nucleobase + 2-deoxy-d-ribose 5-phosphate => a purine 2'-deoxyribonucleoside 5'-phosphate + h2o