Answer
The answer is attached below.
Work Step by Step
Esters are drawn according to the nomenclature system rules set by the IUPAC.
1. In butyl ethanoate, The ethanoate has 2 carbon atoms, one of the carbon atoms contains an ester group.
2. A butyl group, which has a hydrocarbon chain of 4 carbon atoms is attached to the ester bond of ethanoate.