<span class="citations"><p>Bhaskar Reddy Guntoori, Svetoslav S. Bratovanov, Mohamed Ibrahim Zaki, Elena Bejan, Stephen E. Horne, "Process for the preparation and purification of eplerenone." U.S. Patent US20080234478, issued September 25, 2008.</p>
</span><a href="https://www.google.com/?tbm=pts#q=20080234478&amp;tbm=pts" rel="noopener" target="_blank">US20080234478</a>