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