InChI=1S/C19H18O7S/c1-12(2)3-6-15-7-13(10-18(22)19(15)26-27(23,24)25)4-5-14-8-16(20)11-17(21)9-14/h3-11,20-22H,1H2,2H3,(H,23,24,25)/b5-4+,6-3+