<span class="citations"><p>Takehiro Amano, Masami Goi, Kazuto Sekiuchi, Tomomichi Yoshida, Masahiro Hasegawa, "Process for preparing erythromycin A oxime or a salt thereof." U.S. Patent US5274085, issued October, 1966.</p>
</span><a href="https://www.google.com/?tbm=pts#q=5274085&amp;tbm=pts" rel="noopener" target="_blank">US5274085</a>