*The following content is generated by AI and is for reference only.
<h3>Overview</h3>
<p>Captopril Impurity E (EP) is a critical reference standard for pharmaceutical quality control, defined as <strong>N-[(2S)-1-ethoxy-1-oxopropan-2-yl]-L-proline</strong>. Synthesized via esterification of L-proline derivatives, it serves to identify degradation pathways in the active pharmaceutical ingredient. Molecular formula: <strong>C9H15NO4</strong>; CAS No.: <strong>67308-55-6</strong>.</p>
<h3>Application</h3>
<ul>
<li><strong>Quality Assurance:</strong> Used in HPLC method validation to quantify trace impurities in Captopril tablets.</li>
<li><strong>R&D:</strong> Employed in stability-indicating studies to monitor hydrolysis and oxidation profiles.</li>
<li><strong>Regulatory Compliance:</strong> Supports ICH Q3A guidelines for establishing acceptable daily intake limits.</li>
</ul>
<h3>Precautions</h3>
<p>Store at <strong>-20°C</strong> under inert atmosphere to prevent hydrolysis. Handle with PPE in well-ventilated areas; avoid direct skin contact. Not for clinical use; strictly for laboratory analytical purposes only.</p>