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