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I came across this molecule with the following IUPAC name: 1,4-Diazabicyclo[2.2.2]octane

What do the dots inside the brackets mean, or where can I read about the IUPAC guidelines that require this?

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The dots are used in bicyclic compounds and indicate the number of carbons in each bridge. DABCO has three bridges, each with two carbons.

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