<span class="citations"><p>Nicholas J. Sisti, Charles S. Swindell, "Method for docetaxel synthesis." U.S. Patent US5688977, issued September, 1991.</p>
</span><a href="https://www.google.com/?tbm=pts#q=5688977&amp;tbm=pts" rel="noopener" target="_blank">US5688977</a>