InChI=1S/C20H25NO7S/c1-15(2)13-21-20(22)9-4-3-7-17(28-29(23,24)25)8-5-6-16-10-11-18-19(12-16)27-14-26-18/h3-7,9-12,15,17H,8,13-14H2,1-2H3,(H,21,22)(H,23,24,25)/b6-5+,7-3+,9-4+