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