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Give the product structure and the mechanism for the reaction of diethyl carbonate with ethyl 3-phenylpropionate...

Give the product structure and the mechanism for the reaction of diethyl carbonate with ethyl 3-phenylpropionate reacted sequentially with:

a) sodium ethoxide in ethanol

b) sodium hydroxide

c) aqueous acid

d) heat

Thank you so very much! (:

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