2H-Pyrido(3,2-b)-1,4-oxazin-3(4H)-one, 4-(2-(diethylamino)-1-phenylethyl)-, dihydrochloride 4-(2-(Diethylamino)-1-phenylethyl)-2H-pyrido(3,2-b)-1,4-oxazin-3(4H)-one dihydrochloride 88809-64-7