InChI=1S/C17H14O9S/c18-13-4-1-11(9-15(13)20)3-6-17(21)25-8-7-12-2-5-14(19)16(10-12)26-27(22,23)24/h1-10,18-20H,(H,22,23,24)/b6-3+,8-7?