18520-54-2 3,3'-(Terephthaloylbis(imino-p-phenylene))bis(1-propylpyridinium) di-p-toluenesulfonate 3,3'-(Terephthaloyldiiminobis(p-phenylene))bis(1-propylpyridinium) di-p-toluenesulfonate Pyridinium, 3,3'-(terephthaloylbis(imino-p-phenylene))bis(1-propyl-, di-p-toluenesulfonate