InChI=1S/C19H22O7S/c1-13(2)10-17(26-27(21,22)23)11-14(3)8-9-24-16-6-4-15-5-7-19(20)25-18(15)12-16/h4-8,10,12,17H,9,11H2,1-3H3,(H,21,22,23)/b14-8+