InChI=1S/C19H13NO5/c21-17(19(22)23)15-11-4-2-1-3-10(11)14-13-9(5-6-20-16(13)15)7-12-18(14)25-8-24-12/h1-4,7,20H,5-6,8H2,(H,22,23)