16409-13-5 24652-48-0 75349-71-2 D-Ribitol, 1-C-(7-amino-1H-pyrazolo(4,3-d)pyrimidin-3-yl)-1,4-anhydro-, 5-(tetrahydrogen triphosphate), (1S)- FTP Formycin 5'-triphosphate Formycin A 5'-triphosphate formycin triphosphate