InChI=1S/C19H17NO5S3/c1-10-4-7-17(11(2)8-10)28(24,25)20-13-9-16(27-18(13)19(22)23)15-6-5-14(26-15)12(3)21/h4-9,20H,1-3H3,(H,22,23)