title: Letter: Nonaqueous titration of procainamide hydrochloride.
mesh_terms: D000812:Anhydrides; D055598:Chemical Phenomena; D002621:Chemistry; D007202:Indicators and Reagents; D008722:Methods; D010472:Perchlorates; D011342:Procainamide
chemical_list: D000812:Anhydrides; D007202:Indicators and Reagents; D010472:Perchlorates; D011342:Procainamide