InChI=1S/C20H27NO7S/c1-15(2)13-21-20(22)11-9-17(28-29(23,24)25)7-5-3-4-6-16-8-10-18-19(12-16)27-14-26-18/h4,6,8-12,15,17H,3,5,7,13-14H2,1-2H3,(H,21,22)(H,23,24,25)/b6-4+,11-9+