Synonyms: Butanamide, 2,2'-((3,3'-dichloro(1,1'-biphenyl)-4,4'-diyl)bis(2,1-diazenediyl))bis(3-oxo-, N,N'-bis(phenyl and o-tolyl) derivs.;3,3'-Dimethoxy-(1,1'-biphenyl)-4,4'-bisdiazonium, acetoacetanilide, acetoacet-o-toluidide reaction product;Butanamide, 2,2'-((3,3'-dichloro(1,1'-biphenyl)-4,4'-diyl)bis(azo))bis(3-oxo-, N,N'-bis(phenyl and o-tolyl) derivs.