Chemical structure of <a href="https://en.wikipedia.org/wiki/Diaminobutane" class="extiw" title="en:Diaminobutane">diaminobutane</a>.
<a href="//commons.wikimedia.org/wiki/User:Edgar181" title="User:Edgar181">Edgar181</a>
2007-10-23 14:46
<span class="int-own-work" lang="en">Own work</span>