1,3-Benzenediamine, N,N-dimethyl-, dihydrochloride 2836-04-6 3575-32-4 EINECS 222-693-0 N,N-Dimethyl-m-phenylenediamine dihydrochloride N,N-Dimethylbenzene-1,3-diamine dihydrochloride NSC 87900 m-Phenylenediamine, N,N-dimethyl-, dihydrochloride