InChI=1S/C16H12O10S/c1-24-16-14-9(18)5-11(25-13(14)6-10(19)15(16)20)7-2-3-8(17)12(4-7)26-27(21,22)23/h2-6,17,19-20H,1H3,(H,21,22,23)