InChI=1S/C19H16O9S/c20-10-13(21)18(28-29(24,25)26)15(11-6-2-1-3-7-11)16-17(22)12-8-4-5-9-14(12)27-19(16)23/h1-9,15,18,20,23H,10H2,(H,24,25,26)