InChI=1S/C21H22N2O8/c1-20(30)7-4-3-5-10(24)11(7)15(25)12-8(20)6-9-14(23-2)16(26)13(19(22)29)18(28)21(9,31)17(12)27/h3-5,8-9,13-14,23-24,27,30-31H,6H2,1-2H3,(H2,22,29)/t8?,9?,13?,14?,20-,21+/m1/s1