InChI=1S/C15H12O11S/c16-5-3-8(18)10-9(4-5)25-14(13(21)12(10)20)6-1-2-7(17)15(11(6)19)26-27(22,23)24/h1-4,13-14,16-19,21H,(H,22,23,24)