2-Ethyl-4-(2-(4-morpholinyl)-1-phenylethyl)-3,4-dihydro-2H-pyrido(3,2-b)-1,4-oxazine 3HCl 2H-Pyrido(3,2-b)-1,4-oxazine, 3,4-dihydro-2-ethyl-4-(2-(4-morpholinyl)-1-phenylethyl)-, trihydrochloride 88810-19-9