label: a purine 2'-deoxy-D-ribonucleoside + phosphate <=> a purine nucleobase + 2-deoxy-alpha-D-ribose 1-phosphate
label_lc: a purine 2'-deoxy-d-ribonucleoside + phosphate <=> a purine nucleobase + 2-deoxy-alpha-d-ribose 1-phosphate