InChI=1S/C20H27NO7S/c1-15(2)13-21-20(22)12-17(28-29(23,24)25)8-6-4-3-5-7-16-9-10-18-19(11-16)27-14-26-18/h5-11,15,17H,3-4,12-14H2,1-2H3,(H,21,22)(H,23,24,25)/b7-5+,8-6+