2H-Pyrazino(2,3-b)-1,4-thiazin-3(4H)-one, 4-(2-(diethylamino)ethyl)-, monohydrochloride 4-(2-(Diethylamino)ethyl)-2H-pyrazino(2,3-b)-1,4-thiazin-3(4H)-one hydrochloride 55879-60-2