1,4-Benzenedimethanamine, 2,3,5,6-tetrachloro-N,N,N',N'-tetramethyl-, dihydrochloride 1,4-Bis(dimethylaminomethyl)-2,3,5,6-tetrachlorobenzene dihydrochloride 2,3,5,6-Tetrachloro-N,N,N',N'-tetramethyl-1,4-benzenedimethanamine dihydrochloride 55405-20-4