Core structure of a <a href="https://en.wikipedia.org/wiki/phosphatidylcholine" class="extiw" title="w:phosphatidylcholine">w:phosphatidylcholine</a> (skeletal formula).
<a href="//commons.wikimedia.org/wiki/User:Hbf878" title="User:Hbf878">Hbf878</a>
2017-11-03
<span class="int-own-work" lang="en">Own work</span>