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