Structure diagram of <a href="https://en.wikipedia.org/wiki/butyric_acid" class="extiw" title="en:butyric acid">butyric acid</a> with the alpha, beta, and gamma carbons marked.
<a href="//commons.wikimedia.org/wiki/User:Seppi333" title="User:Seppi333"><b><font color="#32CD32">Seppi</font><i><font color="Black">333</font></i></b></a>
<span class="int-own-work" lang="en">Own work</span>