3-Ribofuranosyl-pyrimido(1,2-a)purin-10(3H)-one 78880-62-3 Gma-rppo Pyrimido(1,2-a)purin-10(3H)-one, 3-beta-D-ribofuranosyl- beta-D-Ribofuranosylpyrimido(1,2-a)purin-10(3H)-one