InChI=1S/C19H20O7S/c1-19(2,22)10-9-16-17(20)11-14(12-18(16)21)4-3-13-5-7-15(8-6-13)26-27(23,24)25/h3-12,20-22H,1-2H3,(H,23,24,25)/b4-3+,10-9+