18520-52-0 3,3'-(Terephthaloylbis(imino-p-phenylene))bis(1-methylpyridinium) di-p-toluenesulfonate 3,3'-(Terephthaloyldiiminobis(p-phenylene))bis(1-methylpyridinium) di-p-toluenesulfonate Pyridinium, 3,3'-(terephthaloylbis(imino-p-phenylene))bis(1-methyl-, di-p-toluenesulfonate