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nitrogen atom with a carboxylate group attached to it via a -CH₂- link. All compounds whose structure includes this motif are known as betaines. Betaines do not isomerize because the chemical groups attached to the nitrogen atom are not labile. These compounds may be classed as permanent zwitterions, as isomerisation to a molecule with no electrical charges does not occur, or is very slow. Other examples of permanent zwitterions

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