InChI=1S/C19H23NO7S/c21-19(20-11-5-2-6-12-20)17(27-28(22,23)24)8-4-1-3-7-15-9-10-16-18(13-15)26-14-25-16/h1,3-4,7,9-10,13,17H,2,5-6,8,11-12,14H2,(H,22,23,24)/b4-1+,7-3+