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