InChI=1S/C18H22N2O4/c1-12(8-13-2-5-15(22)6-3-13)19-10-18(24)14-4-7-17(23)16(9-14)20-11-21/h2-7,9,11-12,18-19,22-24H,8,10H2,1H3,(H,20,21)