4,4'-bis-[4-(3-ethyl-3H-benzothiazol-2-ylidene)-but-2-enylidene]-2,2'-diphenyl-2,4,2',4'-tetrahydro-5,5'-m-phenylene-bis-pyrazol-3-one
4,4'-bis-[2-(3-ethyl-3H-benzooxazol-2-ylidene)-ethylidene]-2,2'-diphenyl-2,4,2',4'-tetrahydro-5,5'-m-phenylene-bis-pyrazol-3-one
4,4'-bis-[2-(3-ethyl-3H-benzothiazol-2-ylidene)-ethylidene]-2,2'-diphenyl-2,4,2',4'-tetrahydro-5,5'-m-phenylene-bis-pyrazol-3-one
4,4'-bis-[2-(3-ethyl-3H-benzoselenazol-2-ylidene)-ethylidene]-2,2'-diphenyl-2,4,2',4'-tetrahydro-5,5'-m-phenylene-bis-pyrazol-3-one
4,4'-bis-(3-ethyl-3H-benzothiazol-2-ylidene)-2,2'-diphenyl-2,4,2',4'-tetrahydro-5,5'-m-phenylene-bis-pyrazol-3-one