1,4-Benzenediamine, N,N-dimethyl-, sulfate 4-Amino-N,N-dimethylaniline sulphate 6219-73-4 99-98-9 EINECS 228-292-7 N,N-Dimethyl-1,4-benzenediamine sulfate N,N-Dimethyl-p-phenylenediamine sulfate