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