137103-31-2 3-Benzyl-5-methyl-3-(beta-ribofuranosyl)pyrido(2,3-d)pyrimidine-2,4(1H,3H)dione Pyrido(2,3-d)pyrimidine-2,4(1H,3H)-dione, 5-methyl-3-(phenylmethyl)-1-beta-D-ribofuranosyl- TI 79 TI-79