InChI=1S/C19H18O8S/c1-11(10-26-28(23,24)25)2-5-15-16(21)6-13(7-17(15)22)18-8-12-3-4-14(20)9-19(12)27-18/h2-4,6-9,20-22H,5,10H2,1H3,(H,23,24,25)/b11-2+