InChI=1S/C19H20O5S/c20-18(13-11-16-7-3-1-4-8-16)15-19(24-25(21,22)23)14-12-17-9-5-2-6-10-17/h1-10,12,14,19H,11,13,15H2,(H,21,22,23)/b14-12+