Structure of <a href="https://en.wikipedia.org/wiki/8-Cyclopentyl-1,3-dimethylxanthine" class="extiw" title="w:8-Cyclopentyl-1,3-dimethylxanthine">8-cyclopentyltheophylline</a>.
<a href="//commons.wikimedia.org/wiki/User:Krishnavedala" title="User:Krishnavedala">Krishnavedala</a>
2014-08-04
<span class="int-own-work" lang="en">Own work</span>