Ethyl heptanoate (see the attached image for the structure).
Explanation:
The reaction of heptanoic acid and ethanol will result ethyl heptanoate ester.
Ethyl heptanoate is the ester resulting from the condensation of heptanoic acid and ethanol. It is used in the flavor industry because of its odor that is similar to grape.
Kindly, see the attached image of the structure and the reaction.