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