*The following content is generated by AI and is for reference only.
<h3>Overview</h3>
<p><strong>1R 3S 4R-Ent-Entecavir</strong> is a chiral intermediate for antiviral synthesis. Molecular formula: C<sub>8</sub>H<sub>11</sub>N<5>O<sub>3</sub>. CAS No.: Not publicly listed as bulk API.</p>
<h3>Application</h3>
<ul>
<li>Pharmaceutical manufacturing of Hepatitis B therapeutics.</li>
<li>Research and development of nucleoside analogues.</li>
<li>Quality control standard for drug substance verification.</li>
</ul>
<h3>Precautions</h3>
<p>Store below -20°C in dry, inert atmosphere. Avoid skin contact; use PPE. Clinical use restricted to prescription-only settings with renal monitoring.</p>