InChI=1S/C19H23NO7S/c21-19(20-10-4-1-5-11-20)13-16(27-28(22,23)24)7-3-2-6-15-8-9-17-18(12-15)26-14-25-17/h2-3,6-9,12,16H,1,4-5,10-11,13-14H2,(H,22,23,24)/b6-2+,7-3+