InChI=1S/C20H22N2O5/c23-15-7-3-13(4-8-15)19(25)22-17-12-21-11-1-2-18(17)27-20(26)14-5-9-16(24)10-6-14/h3-10,17-18,21,23-24H,1-2,11-12H2,(H,22,25)/t17-,18-/m1/s1