InChI=1S/C20H22N2O6/c1-12-2-4-15(5-3-12)28-11-14(6-7-23)22-17-9-13(8-16(21)20(26)27)18(24)10-19(17)25/h2-7,9-10,16,22,24-25H,8,11,21H2,1H3,(H,26,27)/b14-6+/t16-/m0/s1