Ester structure and grignard reagent reaction?

An ester and 2 equivalents of a Grignard reagent reacted to form 3-ethyl-3-pentanol and 1-cyclohexyl-1-ethanol after acid workup.

I need the structure of the ester. I the Grignard reagent is :CH3CH2MgBr. I have no idea how to get the ester structure!
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