InChI=1S/C19H18N2O7/c1-28-12-4-2-3-11(7-12)5-6-17(24)21-14-9-16(23)15(22)8-13(14)19(27)20-10-18(25)26/h2-9,22-23H,10H2,1H3,(H,20,27)(H,21,24)(H,25,26)