InChI=1S/C16H12N2O8S2/c19-14-8-9-7-12(28(24,25)26)5-6-13(9)15(16(14)20)18-17-10-1-3-11(4-2-10)27(21,22)23/h1-8,19-20H,(H,21,22,23)(H,24,25,26)/b18-17+