InChI=1S/C21H26N2O10/c1-8-5-6-9(10(7-8)15-22-19(30)21(4,23-15)20(2,3)31)17(29)33-18-13(26)11(24)12(25)14(32-18)16(27)28/h5-7,11-14,18,24-26,31H,1-4H3,(H,27,28)(H,22,23,30)