1,3,4,6,7,11b-Hexahydro-2H-pyrazino(2,1-a)isochinolin 1,3,4,6,7,11b-Hexahydro-2H-pyrazino(2,1-a)isoquinoline 5234-86-6 Azaquinzole Azaquinzole [INN] Azaquinzolum