1,2-Diamino-4-beta-D-ribofuranosylpyrazin-2-onium chloride 1,2-Diamino-4-beta-ribofuranosylpyrazin-2-onium 1,2-Drpo 2(1H)-Pyrazinone, 4-amino-3,4-dihydro-3-imino-1-beta-D-ribofuranosyl-, monohydrochloride 4-Amino-3,4-dihydro-3-imino-1-beta-D-ribofuranosyl-2(1H)-pyrazinone monohydrochloride 83831-25-8