Determine where the function is concave downward. 
Definitions:
Dimethylcyclopentane
A chemical compound consisting of a cyclopentane ring with two methyl groups attached to it.
Ethanol
A volatile, flammable, colorless liquid alcohol widely used as a solvent and a beverage intoxicating agent.
Mechanism
A process or series of steps that bring about a particular result, often described in the context of chemical reactions.
Organic Product
A compound or substance that has been synthesized from living organisms or contains carbon-based molecules.
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