InChI=1S/C19H20O7S/c1-12(2)3-7-15-17(21)9-14(10-18(15)22)5-4-13-6-8-16(20)19(11-13)26-27(23,24)25/h3-12,20-22H,1-2H3,(H,23,24,25)/b5-4+,7-3+