<span class="citations"><p>Hendricus B. A. de Bont, Ruben G. G. Leenders, Johan W. Scheeren, Hidde J. Haisma, Dick de Vos, "Paclitaxel prodrugs, method for preparation as well as their use in selective chemotherapy." U.S. Patent US5760072, issued September, 1989.</p>
</span><a href="https://www.google.com/?tbm=pts#q=5760072&amp;tbm=pts" rel="noopener" target="_blank">US5760072</a>