11-Methoxy-2H-3,4,6,7-tetrahydropyrimido(2',1':3,4)pyrazino(1,2-a)indole hydrochloride 127556-86-9 2H-Pyrimido(2',1':3,4)pyrazino(1,2-a)indole, 3,4,6,7-tetrahydro-11-methoxy-, monohydrochloride