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<h3>Overview</h3>
<p><strong>Caspofungin Acetate-d4</strong> is a stable isotope-labeled internal standard for Caspofungin acetate, utilized in quantitative mass spectrometry. Synthesized via deuterium exchange or specific biosynthetic pathways, its molecular formula is C<sub>51</sub>H<sub>67</sub>N<sub>9</sub>O<sub>12</sub>D<sub>x</sub>. The CAS number remains associated with the unlabeled parent compound (170883-80-4), while this isotopologue serves as a precise analytical reference.</p>
<h3>Application</h3>
<ul>
<li>Pharmaceutical R&D: Calibration and quantification of antifungal drugs in bioanalytical assays.</li>
<li>Clinical Pharmacokinetics: Metabolite profiling and ADME studies using LC-MS/MS.</li>
<li>Quality Control: Verification of drug purity and stability in pharmaceutical manufacturing.</li>
</ul>
<h3>Precautions</h3>
<p>Store at -20°C in sealed containers to prevent hydrolysis and isotopic exchange. Handle only within certified laboratories using appropriate PPE to avoid inhalation or dermal contact. Not intended for direct clinical administration.</p>