Use the name of the alkane corresponding to the total number of carbon atoms in the rings as the parent name.

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Use the name of the alkane corresponding to the total number of carbon atoms in the rings as the parent name.
IUPAC Nomenclature of bicyclic compounds
This is one topic I hate teaching. Mostly because I never had to learn it for undergrad, work, or graduate school. Ugh, I'm inclined to skip it entirely.