InChI=1S/C18H15NO6S/c1-18(10-24-26(21,22)23)7-6-13-16-14(8-11(9-20)17(13)25-18)12-4-2-3-5-15(12)19-16/h2-9,19H,10H2,1H3,(H,21,22,23)