1H-Pyrazino(3,2,1-jk)carbazole, 2,4,5,6-tetrahydro-8-methyl-, monohydrochloride 2,4,5,6-Tetrahydro-8-methyl-1H-pyrazino(3,2,1-jk)carbazole monohydrochloride 73166-21-9 8-Methyl-2,4,5,6-tetrahydro-1H-pyrazino(3,2,l-jk)carbazole hydrochloride