75899-14-8 BRN 5166233 D-Ribitol, 5-S-(3-amino-3-carboxypropyl)-1-C-(7-amino-1H-pyrazolo(4,3-d)pyrimidin-3-yl)-1,4-anhydro-5-thio-, (1S,5(S))- Formycinylhomocysteine