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If you only had one methyl group, you would name it 1-isopropyl-2-methylcyclopentane. But in this case you have two methyl groups so your numbering options are either 1-isopropyl-2,2-dimethyl or 2-isopropyl-1,1-dimethyl. Repeating the 1 is better than repeating the 2 so the name of this molecule is 2-isopropyl-1,1-dimethylcyclopentane.
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