(1,1'-Biphenyl)-3,3',4,4'-tetramine compd. with dimethyl (methylthio)methylidynedicarbamate 3,3',4,4'-Biphenyltetramine compd. with dimethyl (methylthio)methylidynedicarbamate DV8751500 Dimethyl (methylthio)methylidynedicarbamate compd. with 3,3',4,4'-biphenyltetramine reaction product of 3,3'-Diaminobenzidine and 1,3-dicarbomethoxy-2-methyl-2-thiopseudourea