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