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