InChI=1S/C22H26N2O5/c25-18-8-3-16(4-9-18)5-12-21(28)23-13-1-2-14-24-22(29)15-20(27)17-6-10-19(26)11-7-17/h3-12,20,25-27H,1-2,13-15H2,(H,23,28)(H,24,29)/b12-5+