A chemical compound where an amino group is attached to a molecule containing two benzene rings linked together.
From amino- + di- (two) + phenyl (benzene ring). Emerged in 19th-century organic chemistry as chemists synthesized and named compounds with multiple aromatic rings.
4,4'-Methylenebis(2-chloroaniline) and similar aminodiphenyl compounds were once widely used in plastics and dyes until they were discovered to be carcinogens—a cautionary tale about how useful chemistry can be dangerous.
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