*The following content is generated by AI and is for reference only.
<h3>Overview</h3>
<p><strong>L-(+)-Ergothioneine-d9</strong> is a deuterium-labeled isotopic standard of the natural antioxidant ergothioneine, synthesized via high-precision deuteration for mass spectrometry applications. Molecular formula: C<sub>6</sub>H<sub>10</sub>D<sub>5</sub>N<sub>4</sub>O<sub>2</sub>S; CAS: 22978-68-1.</p>
<h3>Application</h3>
<ul>
<li>Metabolomics research for tracer studies in cellular redox pathways.</li>
<li>Quantitative analysis in pharmaceutical development using LC-MS/MS.</li>
<li>Quality control validation for endogenous L-ergothioneine assays.</li>
</ul>
<h3>Precautions</h3>
<p>Store at -20°C under inert atmosphere to prevent degradation. Use only as a reference standard; not approved for direct clinical administration or dietary supplementation without regulatory clearance.</p>