InChI=1S/C22H22N2O4/c25-22-23-21(28-14-18-13-26-9-10-27-18)12-20-19-6-5-16(4-3-15-1-2-15)11-17(19)7-8-24(20)22/h5-6,11-12,15,18H,1-2,7-10,13-14H2/t18-/m0/s1