InChI=1S/C20H32O8S/c21-15-7-3-4-8-17(28-29(25,26)27)13-11-16-12-14-19(22)18(16)9-5-1-2-6-10-20(23)24/h11,13,17,21H,1-10,12,14-15H2,(H,23,24)(H,25,26,27)/b13-11+