Chemical structure of <a href="https://en.wikipedia.org/wiki/alprostadil" class="extiw" title="w:alprostadil">alprostadil</a> (prostaglandin E<sub>1</sub>).
<a href="//commons.wikimedia.org/wiki/User:Edgar181" title="User:Edgar181">Edgar181</a>
2010-11-16 14:17
<span class="int-own-work" lang="en">Own work</span>