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