2H-Pyrido(3,2-b)-1,4-oxazin-3(4H)-one, 4-(phenylmethyl)-2-propyl-, monohydrochloride 4-(Phenylmethyl)-2-propyl-2H-pyrido(3,2-b)-1,4-oxazin-3(4H)-one monohydrochloride 88799-58-0