Step-by-step explanation:
In the structure of the sodium 2,3,3-trimethylhexanoate, one sodium atom is linked to oxygen atom which is further attached to carbon branch with six carbon atom.
On the second carbon atom from the side of oxygen atom the there is a methyl group.
On the third carbon atom from the side of oxygen atom the there are two methyl groups.
Structure of the given molecule is attached in an image.