InChI=1S/C19H18O6S/c1-13(2)3-7-16-9-14(6-8-19(16)25-26(22,23)24)4-5-15-10-17(20)12-18(21)11-15/h3-12,20-21H,1H2,2H3,(H,22,23,24)/b5-4+,7-3+