Synonyms: Acetoacetanilide,2,2''-[(3,3'-dichloro-4,4'-biphenylylene)bis(azo)]bis[2'-chloro- (6CI,8CI);Butanamide,2,2'-[(3,3'-dichloro[1,1'-biphenyl]-4,4'-diyl)bis(azo)]bis[N-(2-chlorophenyl)-3-oxo-(9CI); C.I. Pigment Yellow 121; C.I. Pigment Yellow 63; Pigment Yellow 63