


Refer to the above structure. The hydrocarbon chain consists of 10 carbon fropus in the backbone. So it is a decane. At the 4th carbon atom of this chain, there is 1 methyl group on top, and another ethyl group (in the box) attached to 2 methyl groups. And at the 3rd position there is an ethyl group.
This is how it gets its IUPAC name.
