InChI=1S/C21H22N2O7/c1-23(2)15-10-7-9-6-8-4-3-5-11(24)12(8)16(25)13(9)18(27)21(10,30)19(28)14(17(15)26)20(22)29/h3-5,9-10,15,24,26-27,30H,6-7H2,1-2H3,(H2,22,29)/t9-,10-,15-,21-/m0/s1