InChI=1S/C20H29NO7S/c1-16(14-28-29(23,24)25)13-21-20(22)9-7-5-3-2-4-6-8-17-10-11-18-19(12-17)27-15-26-18/h6,8,10-12,16H,2-5,7,9,13-15H2,1H3,(H,21,22)(H,23,24,25)/b8-6+