InChI=1S/C16H22N2O4/c1-11(2)9-16(22-3)14(20)17-15(21,13(19)18-16)10-12-7-5-4-6-8-12/h4-8,11,21H,9-10H2,1-3H3,(H,17,20)(H,18,19)/t15-,16+/m1/s1