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