InChI=1S/C17H15NO7S/c1-24-16-8-11-4-5-18-13(12(11)9-15(16)20)6-10-2-3-14(19)17(7-10)25-26(21,22)23/h2-5,7-9,19-20H,6H2,1H3,(H,21,22,23)