InChI=1S/C19H14O7S/c20-16-12-8-13-18(25-13)11-7-6-10(9-4-2-1-3-5-9)15(14(11)12)17(21)19(16)26-27(22,23)24/h1-8,13,16,18-20H,(H,22,23,24)