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