InChI=1S/2C18H14N2O6S/c2*1-10-6-7-14(15(8-10)27(24,25)26)19-20-16-12-5-3-2-4-11(12)9-13(17(16)21)18(22)23/h2-9,21H,1H3,(H,22,23)(H,24,25,26);2-9,19H,1H3,(H,22,23)(H,24,25,26)/b20-19+;20-16-