1,N(2)-Ethenoguanosine 3,4-Dihydro-3-beta-D-ribofuranosyl-9H-imidazo(1,2-alpha)purine-9-one 5,9-Dihydro-9-oxo-3-beta-D-ribofuranosylimidazo(1,2-a)purine 62462-38-8 9H-Imidazo(1,2-alpha)purine-9-one, 3,4-dihydro-3-beta-D-ribofuranosyl-