InChI=1S/C21H26N2O7/c1-30-17-10-5-8-15(19(17)27)20(28)22-11-3-2-6-13(12-24)23-21(29)14-7-4-9-16(25)18(14)26/h4-5,7-10,13,24-27H,2-3,6,11-12H2,1H3,(H,22,28)(H,23,29)/t13-/m0/s1