p-Phenylenediamine dihydrochloride, 99+%..
p-Toluenesulfinic acid, sodium salt hydrate, 98+%..
p-Toluenesulfinic acid, sodium salt, 97%, anhydrous..
p-Toluenesulfonic acid monohydrate, 97.5%, pure..
p-Toluenesulfonic acid monohydrate, 99%, extra pure..
p-Toluenesulfonic acid monohydrate, ACS reagent..
p-Toluenesulfonic acid, pure, 12% in acetic acid..