InChI=1S/C21H24N2O7/c1-9(24)18(27)15(25)23-14-19(28)12(17(23,2)3)8-10-6-5-7-11-13(10)20(19,16(26)22(11)4)30-21(14,18)29/h5-7,10,12-14,27-29H,8H2,1-4H3