The Cyanogen reference article from the English Wikipedia on 24-Jul-2004
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Cyanogen

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Cyanogen is a chemical compound C2N2. The CN entity behaves like a halogen. As do halogens, it forms molecules consisting of two CN groups, N≡C-C≡N. Compounds containg the CN group are called cyanides, cyanates, and isocyanates. "Cyanogen" refers to a single CN group in some molecules, such as cyanogen chloride (NCCl).