Synonyms: 1H-Pyrazolo(3,4-d)pyrimidine-3,4(2H,5H)-dione, 6-amino-1-b-D-ribofuranosyl-;1H-Pyrazolo[3,4-d]pyrimidine-3,4(2H,5H)-dione, 6-amino-1-b-D-ribofuranosyl-;6-Amino-3-oxo-1-.beta.-D-ribofuranosylpyrazolo[3,4-d]pyrimidin-4(5H)-one;6-Amino-3-oxo-1-beta-D-ribofuranosylpyrazolo(3,4-d)pyrimidin-4(5H)-one