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