InChI=1S/C18H22N2O3/c1-5-18(3,4)20-11-13(14-8-6-7-9-16(14)20)10-15(17(22)23)19-12(2)21/h5-9,11,15H,1,10H2,2-4H3,(H,19,21)(H,22,23)