InChI=1S/C21H28N2O10/c1-8(2)21(4,20(30)31)23-16(22)11-7-9(3)5-6-10(11)18(29)33-19-14(26)12(24)13(25)15(32-19)17(27)28/h5-8,12-15,19,24-26H,1-4H3,(H2,22,23)(H,27,28)(H,30,31)