InChI=1S/C15H12O12S/c16-5-3-6(17)10(20)15-9(5)11(21)12(22)13(26-15)4-1-7(18)14(8(19)2-4)27-28(23,24)25/h1-3,12-13,16-20,22H,(H,23,24,25)