Structural formula of the chemical compound <a href="https://en.wikipedia.org/wiki/3-methylpentane" class="extiw" title="w:3-methylpentane">3-methylpentane</a> with main branch and alkyl group highlighted.
<a href="//commons.wikimedia.org/wiki/User:Borb" title="User:Borb">Borb</a>
<span class="int-own-work" lang="en">Own work</span>