<a href="https://en.wikipedia.org/wiki/Acetylene" class="extiw" title="en:Acetylene">Acetylene</a> 2D skeletal structure.
<a href="//commons.wikimedia.org/wiki/User:Erin_Silversmith" title="User:Erin Silversmith">User:Erin Silversmith</a>
Based on the public-domain <a href="//commons.wikimedia.org/w/index.php?title=File:Acetylene-2D-skeletal.png&amp;action=edit&amp;redlink=1" class="new" title="File:Acetylene-2D-skeletal.png (page does not exist)">Image:Acetylene-2D-skeletal.png</a> by <a href="//commons.wikimedia.org/wiki/User:Benjah-bmm27" title="User:Benjah-bmm27">User:Benjah-bmm27</a>.