InChI=1S/C18H13NO5/c20-9-1-2-10-11(6-9)15(18(21)22)16-13-8(3-4-19-16)5-12-17(14(10)13)24-7-23-12/h1-2,5-6,19-20H,3-4,7H2,(H,21,22)