InChI=1S/C20H28N2O11/c1-31-17-11(32-20-16(28)14(26)15(27)18(33-20)19(29)30)4-2-9(13(17)25)3-5-12(24)22-8-10(23)6-7-21/h2-5,10,14-16,18,20,23,25-28H,6-8,21H2,1H3,(H,22,24)(H,29,30)