InChI=1S/C17H14O9S/c1-8-6-11(18)13(19)12-14(20)17(24-2)16(25-15(8)12)9-4-3-5-10(7-9)26-27(21,22)23/h3-7,18-19H,1-2H3,(H,21,22,23)