InChI=1S/C18H17NO5S/c1-18(2)8-7-13-16-14(12-5-3-4-6-15(12)19-16)9-11(17(13)24-18)10-23-25(20,21)22/h3-9,19H,10H2,1-2H3,(H,20,21,22)