InChI=1S/C15H12O12S/c16-6-2-1-5(11(20)15(6)27-28(24,25)26)3-8(18)12(21)10-7(17)4-9(19)13(22)14(10)23/h1-2,4,16-17,19-20,22-23H,3H2,(H,24,25,26)