InChI=1S/C17H13NO8/c19-11-3-1-2-9(6-11)7-14(16(22)23)26-13-5-4-10(8-12(13)20)15(21)18-17(24)25/h1-8,19-20H,(H,18,21)(H,22,23)(H,24,25)/b14-7-