The longest continuous carbon chain in the given structure contains four carbons. This gives us the parent name "butane".
Step 2: Identify and number the substituents
There are two ethyl substituents attached to the parent chain. Numbering the butane chain from either end results in the same locants for the substituents. We choose the lowest possible set of numbers. The ethyl groups are located at the 2 and 3 positions.
Step 3: Construct the IUPAC name
The IUPAC name consists of the substituent names and positions, followed by the parent chain name. Since there are two ethyl groups, we use the prefix "di". The complete IUPAC name is 2,3-diethylbutane.