<span class="citations"><p>Guang-Zhong Wu, Wanda I. Tormos, "Asymmetric process for preparing florfenicol, thiamphenicol chloramphenicol and oxazoline intermediates." U.S. Patent US5352832, issued May, 1992.</p>
</span><a href="https://www.google.com/?tbm=pts#q=5352832&amp;tbm=pts" rel="noopener" target="_blank">US5352832</a>