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                2,5-Dibromoterephthalonitrile
             
            
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                4,4'-Biphenyldicarbonitrile
             
            
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                1,1':4',1''-Terphenyl]-4,4''-dicarbonitrile
             
            
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                Naphthalene-2,6-Dicarbonitrile
             
            
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                9,10-Anthracenedicarbonitrile
             
            
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                4,4'-Bipyridinium, 1,1'-bis(4-cyanophenyl)-, dichloride