InChI=1S/C19H13NO6/c21-16(19(22)23)13-8-1-2-9-18(26-9)12(8)14-11-7(3-4-20-15(11)13)5-10-17(14)25-6-24-10/h1-2,5,9,18,20H,3-4,6H2,(H,22,23)