InChI=1S/C17H16O9S/c1-24-10-4-2-9(3-5-10)14-7-13(19)16-15(26-14)6-12(18)11(17(16)20)8-25-27(21,22)23/h2-6,14,18,20H,7-8H2,1H3,(H,21,22,23)