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