InChI=1S/C18H13NO6/c1-19-9-4-7-2-3-10-17(25-10)12(7)14-13(9)8(15(20)18(21)22)5-11-16(14)24-6-23-11/h2-5,10,17,19H,6H2,1H3,(H,21,22)