Synonyms: o-Toluidine,4,4'-methylenebis[6-ethyl- (8CI);3,3'-Diethyl-5,5'-dimethyl-4,4'-diaminodiphenylmethane; 4,4'-Diamino-3,3'-diethyl-5,5'-dimethyldiphenylmethane;4,4'-Methylenebis(2-ethyl-6-methylaniline);4,4'-Methylenebis(2-methyl-6-ethylaniline);4,4'-Methylenebis[6-ethyl-o-toluidine];Bis(4-amino-3-ethyl-5-methylphenyl)methane; Curehard MD; Curehard MED;Di(4-amino-3-ethyl-5-methylphenyl)methane