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<h3>Overview</h3>
<p><strong>Cyclosporin A-d4 (Major)</strong> is a deuterated internal standard used in quantitative mass spectrometry. It shares identical chemical properties with native Cyclosporin A but features four deuterium atoms. Molecular Formula: C<sub>62</sub>H<sub>110</sub>N<sub>10</sub>O<sub>12</sub>; CAS No.: 856697-48-2.</p>
<h3>Application</h3>
<ul>
<li><li>Pharmaceutical Analysis: Quantification of Cyclosporin A in plasma for therapeutic drug monitoring.</li></li>
<li><li>Metabolomics: Stable isotope tracing in metabolic pathway studies.</li></li>
<li><li>Quality Control: Calibration and validation of LC-MS/MS assays.</li></li>
</ul>
<h3>Precautions</h3>
<p>Store at -20°C under inert atmosphere. Avoid direct light. Use only as an analytical reference standard, not for clinical administration. Handle with appropriate PPE to prevent inhalation or skin contact.</p>