(Dimethylaminomethylene)dimethylammonium chloride (N,N,N′,N′-tetramethylformamidinium chloride) may be used in the synthesis of the following:aminomethylene hydantoinsthiohydantoins2,2′-o-phenyl-enebis(1,3-di-meth-ylguanidine)N,N-dimethylformamide di-tert-butyl acetal
