*The following content is generated by AI and is for reference only.
<h3>Overview</h3>
<p><strong>(R,S)-Norcotinine-pyridyl-d4</strong> is a deuterated internal standard for pharmacokinetic studies. Synthesized via isotopic exchange, its molecular formula is C<sub>10</sub>H<sub>9</sub>D<sub>5</sub>N<sub>2</sub>O. CAS No: <strong>289987-66-8</strong>.</p>
<h3>Application</h3>
<ul>
<li>LC-MS/MS quantification of nicotine metabolites in plasma.</li>
<li>Metabolic pathway tracing in toxicology research.</li>
<li>Quality control validation for pharmaceutical assays.</li>
</ul>
<h3>Precautions</h3>
<p>Store at -20°C in sealed amber vials. Avoid moisture and direct sunlight. Not for human or veterinary clinical use; handle with appropriate PPE.</p>