InChI=1S/C21H22N2O7/c1-9(24)19(27)16(26)23-17(2,3)11-8-10-6-5-7-12-13(10)18(15(25)22(12)4)14(11)20(23,28)21(19,29)30-18/h5-7,11,14,27-29H,8H2,1-4H3/t11-,14-,18+,19-,20+,21-/m1/s1