InChI=1S/C19H18N2O8/c1-29-16-8-12(11(7-15(16)24)19(28)20-9-18(26)27)21-17(25)5-3-10-2-4-13(22)14(23)6-10/h2-8,22-24H,9H2,1H3,(H,20,28)(H,21,25)(H,26,27)