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