InChI=1S/C20H40O5S/c21-19-17-15-13-11-9-7-5-3-1-2-4-6-8-10-12-14-16-18-20-25-26(22,23)24/h2,4,21H,1,3,5-20H2,(H,22,23,24)/b4-2+