Bis-(4-aethoxycarbonylamino-phenyl)-methan, N,N'-(4,4'-Methandiyl-di-phenyl)-bis-carbamidsaeure-diaethylester, O,O'-diethyl 4,4'-methylenebis(4,1-phenylene)dicarbamate, N,N'-(4,4'-methanediyl-di-phenyl)-bis-carbamic acid diethyl ester, diethyl (methylenedi-4,1-phenylene)dicarbamate, diethyl(methylenedi-4,1-phenylene)biscarbamate, 4,4'-methylenebis(phenyl-carbamic acid ethyl ester), 4,4'-bis(ethoxycarboximido)-diphenylmethane