<a href="https://en.wikipedia.org/wiki/Skeletal_structure" class="extiw" title="en:Skeletal structure">Skeletal structure</a> of <i>c</i>,<i>t</i>,<i>c</i>,<i>c</i>-[4.5.5.5]<a href="https://en.wikipedia.org/wiki/fenestrane" class="extiw" title="en:fenestrane">fenestrane</a>. The ring-sizes are in blue (one <a href="https://en.wikipedia.org/wiki/cyclobutane" class="extiw" title="en:cyclobutane">cyclobutane</a> and three <a href="https://en.wikipedia.org/wiki/cyclopentane" class="extiw" title="en:cyclopentane">cyclopentanes</a>). The two red bonds illustrate the <a href="https://en.wikipedia.org/wiki/Cis%E2%80%93trans_isomerism" class="extiw" title="en:Cis–trans isomerism">trans</a> geometry of the adjacent <a href="https://en.wikipedia.org/wiki/Fused_compound" class="extiw" title="en:Fused compound">fused</a> 5/5 rings. The other ring fusions each have cis geometry.
<a href="//commons.wikimedia.org/wiki/User:DMacks" title="User:DMacks">DMacks</a> (<a href="//commons.wikimedia.org/wiki/User_talk:DMacks" title="User talk:DMacks"><span class="signature-talk">talk</span></a>)
<span class="int-own-work" lang="en">Own work</span>