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What is the name of this structure? It's close to Leucine but I'm not sure....


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First of all we need to count the number of carbons in the main chain. In this case there are five atoms so the name prefix will be "penta-". The main functional group is a carboxyl group on the C1. So the methyl group will be on the C4 the molecula suffix will be "-oic acid".

Knowing this is pretty simple:

4-methylpentanoic acid

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