*The following content is generated by AI and is for reference only.
<h3>Overview</h3>
<p>D-Neopterin-13C5 is a stable isotopically labeled internal standard used in quantitative mass spectrometry. It features <strong>deuterium-free 13C labeling</strong> to ensure precise measurement of endogenous neopterin levels. The molecular formula is <strong>C6H8N4O2</strong> with CAS No. <strong>204987-85-3</strong>.</p>
<h3>Application</h3>
<ul>
<li><strong>Metabolic Research:</strong> Quantification of neopterin as an immune activation biomarker.</li>
<li><strong>Clinical Diagnostics:</strong> Validation of assays for monitoring HIV, autoimmune disorders, and cancer progression.</li>
<li><strong>Pharmacokinetics:</strong> Standard for accurate determination of drug metabolite concentrations.</li>
</ul>
<h3>Precautions</h3>
<p>Store at <strong>-20°C</strong> under inert atmosphere to prevent degradation. Use only in certified laboratory settings; direct clinical administration is prohibited.</p>