InChI=1S/C21H22N2O9/c1-23(12-8-10-4-6-14(29-2)17(30-3)16(10)31-20(12)27)19(26)11-9-21(28)15(25)7-5-13(24)18(21)32-22-11/h4-8,13,15,18,24-25,28H,9H2,1-3H3/t13-,15-,18+,21+/m1/s1