InChI=1S/C14H20O5S/c15-10-6-2-5-9-14(12-19-20(16,17)18)11-13-7-3-1-4-8-13/h1,3-4,7-8,11,15H,2,5-6,9-10,12H2,(H,16,17,18)/b14-11-