2H-Pyrazino(2,3-b)-1,4-thiazin-3(4H)-one, 4-(3-(dimethylamino)propyl)-, monohydrochloride 4-(3-(Dimethylamino)propyl)-2H-pyrazino(2,3-b)-1,4-thiazin-3(4H)-one hydrochloride 55879-58-8