4,5-diamino-9-(β-D-ribofuranosyl)pyrrolo<2,3-d:5,4-d'>dipyrimidine

1-[3,4-dihydroxy-5-(hydroxymethyl)oxolan-2-yl]-4-oxo-2H-pyrazolo[3,4-d]pyrimidine-3-carboximidamide,hydrochloride