InChI=1S/C21H33NO6S/c1-15(6-5-7-16(2)20(25)22-12-13-29(26,27)28)8-9-18-17(3)19(24)10-11-21(18,4)14-23/h6,8-9,16,23H,5,7,10-14H2,1-4H3,(H,22,25)(H,26,27,28)/b9-8+,15-6+