(1,1'-Biphenyl)-3,3',4,4'-tetramine compd. with methyl amino(methylthio)methylenecarbamate 3,3',4,4'-Biphenyltetramine compd. with methyl amino(methylthio)methylenecarbamate DV8752500 Methyl amino(methylthio)methylenecarbamate compd. with (1,1'-biphenyl)-3,3',4,4'-tetramine reaction product of 3,3'-Diaminobenzidine and 1-carbomethoxy-2-methyl-2-thiopseudourea