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