InChI=1/C18H18N2O8/c21-14-2-1-9(8-15(14)22)5-11(16(23)24)19-4-3-10-6-12(17(25)26)20-13(7-10)18(27)28/h1-4,6,8,11,13,20-22H,5,7H2,(H,23,24)(H,25,26)(H,27,28)/b10-3-,19-4-/t11?,13-/s2