18472-20-3 2-(2-Dimethylamino-1-methylethoxy)-3-phenyl-4H-pyrazino(1,2-a)pyrimidin-4-one hydrobromide 4H-Pyrazino(1,2-a)pyrimidin-4-one, 2-(2-(dimethylamino)-1-methylethoxy)-3-phenyl-, hydrobromide