InChI=1S/C18H13NO7/c20-12-6-16-15(24-8-25-16)5-11(12)14-4-10-3-9(1-2-13(10)26-14)18(23)19-7-17(21)22/h1-6,20H,7-8H2,(H,19,23)(H,21,22)