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Pyridinium p-toluenesulfonate (PPTS) is a salt of pyridine and p-toluenesulfonic acid. It is a colourless solid.
P 2732 (OTTO) Pyridinium p-toluenesulphonate, 98%+ Cas 24057-28-1 - used as a precursor to agrochemicals and pharmaceuticals, and is also an important solvent and reagent.