Synonyms: Ammonium,[4,4'-biphenylylenebis(2-oxoethylene)]bis[[(2-cyano-2-hydroxycyclohexyl)methyl]dimethyl-,dibromide (8CI); [1,1'-Biphenyl]-4,4'-diethanaminium,N,N'-bis[(2-cyano-2-hydroxycyclohexyl)methyl]-N,N,N',N'-tetramethyl-b,b'-dioxo-, dibromide (9CI)