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viologény
Subject h. viologény Subject h. Viologens Entry terms viologén English X references Viologen Scope note in English A group of dipyridinium chloride derivatives that are used as oxidation-reduction indicators. The general formula is 1,1'-di-R-4,4'-bipyridinium chloride, where R = methyl, ethyl, benzyl or, betaine. 
subject heading
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