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