InChI=1S/C17H14O9S/c1-8(18)25-7-9-5-11-15(13(20)6-9)17(26-27(22,23)24)14-10(16(11)21)3-2-4-12(14)19/h2-6,17,19-20H,7H2,1H3,(H,22,23,24)