# Naming crown ethers

Chemistry Level 1

The molecule above is a crown ether. They are named as $$\displaystyle{n-\text{crown}-m}$$ where $$n$$ is the total number of atoms (except hydrogen) present in the ring and $$m$$ is the number of oxygen atoms. For the above crown ether, what is the value of $$\displaystyle{m+n}$$?

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