InChI=1S/C15H12O12S/c16-6-4-8(18)13(22)14(23)11(6)12(21)7(17)1-5-2-9(19)15(10(20)3-5)27-28(24,25)26/h2-4,16,18-20,22-23H,1H2,(H,24,25,26)