1-Hydrazino-8-methoxy-3,4-dihydropyrazino(1,2-a)indole hydrochloride dihydrate 127556-79-0 Pyrazino(1,2-a)indol-1(2H)-one, 3,4-dihydro-8-methoxy-, hydrazone, hydrochloride, hydrate (1:1:2)