21271-37-4 3-(p-Chlorophenyl)-2-(2-morpholinoethoxy)-4H-pyrazino(1,2-a)pyrimidin-4-one hydrobromide 4H-Pyrazino(1,2-a)pyrimidin-4-one, 3-(p-chlorophenyl)-2-(2-morpholinoethoxy)-, hydrobromide