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