(S)-1-C-(7-Amino-1H-pyrazolo(4,3-d)pyrimidine-3-yl)-1,4-anhydro-D-ribitol cyclic 3',5'-(hydrogen phosphate) 54532-48-8 D-Ribitol, 1-C-(7-amino-1H-pyrazolo(4,3-d)pyrimidine-3-yl)-1,4-anhydro-, cyclic 3',5'-(hydrogen phosphate), (S)- Formycin cyclic 3',5'-monophosphate