13877-76-4 3-(beta-D-Ribofuranosyl)pyrazolo(4,3-d)6(H)-7-ketopyrimidine 7H-Pyrazolo(4,3-d)pyrimidin-7-one, 1,4-dihydro-3-beta-D-ribofuranosyl- 7H-Pyrazolo(4,3-d)pyrimidin-7-one, 1,6-dihydro-3-beta-D-ribofuranosyl- (7CI) BRN 1021587 Formycin B Laurusin NSC 106486 Ohyamycin