InChI=1S/C20H20N2O9/c1-30-13-7-10(3-5-12(13)23)4-6-15(24)22-11-8-14(31-2)18(27)19(28)17(11)20(29)21-9-16(25)26/h3-8,23,27-28H,9H2,1-2H3,(H,21,29)(H,22,24)(H,25,26)