(1,1'-Biphenyl)-4,4'-diamine, 2,2'-dimethyl-, dihydrochloride 2,2'-Dimethyl-1,1'-biphenyl-4,4'-diamine, dihydrochloride 4,4'-Bi-m-toluidine dihydrochloride 60410-99-3 EINECS 262-222-6