InChI=1S/C20H20N2O8/c23-9-21-15(19(27)28)7-11-1-3-17(25)13(5-11)14-6-12(2-4-18(14)26)8-16(20(29)30)22-10-24/h1-6,9-10,15-16,25-26H,7-8H2,(H,21,23)(H,22,24)(H,27,28)(H,29,30)