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