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