InChI=1S/C16H17N3O4/c1-8(2)16(4)14(21)17-12(19-16)11-7-9(3)5-6-10(11)13(20)18-15(22)23/h5-7H,1H2,2-4H3,(H,18,20)(H,22,23)(H,17,19,21)