150885-25-9 4-Amino-1-ribofuranosylpyrrolo(2,3-d)pyridazin-7(6H)-one 4-Amino-1.6-dihydro-1-beta-D-ribofuranosyl-7H-pyrrolo(2,3-d)pyridazin-7-one 4-Nrib-ppo 7H-Pyrrolo(2,3-d)pyridazin-7-one, 4-amino-1.6-dihydro-1-beta-D-ribofuranosyl-