InChI=1S/C20H20N2O8/c1-29-16-7-11(3-5-14(16)23)4-6-18(25)22-13-9-17(30-2)15(24)8-12(13)20(28)21-10-19(26)27/h3-9,23-24H,10H2,1-2H3,(H,21,28)(H,22,25)(H,26,27)