InChI=1S/C20H28O8S/c1-6-11(2)17(21)27-14-8-7-12(3)19(5)10-20(13(4)9-26-18(20)22)16(15(14)19)28-29(23,24)25/h6,12,14-16H,4,7-10H2,1-3,5H3,(H,23,24,25)/b11-6+