InChI=1S/C19H16O9S/c1-10(20)18(28-29(24,25)26)15(11-6-2-4-8-13(11)21)16-17(22)12-7-3-5-9-14(12)27-19(16)23/h2-9,15,18,21,23H,1H3,(H,24,25,26)