InChI=1S/C19H23NO7S/c21-19(20-11-5-7-16(13-20)27-28(22,23)24)8-4-2-1-3-6-15-9-10-17-18(12-15)26-14-25-17/h1-3,6,9-10,12,16H,4-5,7-8,11,13-14H2,(H,22,23,24)/b2-1+,6-3+