2-(2-(Hexahydro-1H-azepin-1-yl)ethoxy)-3-phenyl-4H-pyrazino(1,2-a)pyrimidin-4-one HCl 21271-28-3 4H-Pyrazino(1,2-a)pyrimidin-4-one, 2-(2-(hexahydro-1H-azepin-1-yl)ethoxy)-3-phenyl-, monohydrobromide