*The following content is generated by AI and is for reference only.
<h3>Overview</h3>
<p>N-Acetyl-d3-S-(N-methylcarbamoyl)-L-cysteine is a stable isotopically labeled internal standard used in quantitative mass spectrometry. It features <strong>deuterium substitution</strong> to ensure accurate analytical calibration without altering chemical behavior. The molecular formula is C6H10D3NO4S, and it serves as a critical reference for tracing metabolic pathways of N-acetylcysteine derivatives.</p>
<h3>Application</h3>
<ul>
<li><strong>Pharmaceutical Analysis:</strong> Quantification of drug metabolites in plasma and urine samples via LC-MS/MS.</li>
<li><strong>Clinical Diagnostics:</strong> Monitoring cysteine levels in patients with metabolic disorders or liver toxicity.</li>
<li><strong>Research Development:</strong> Studying enzymatic kinetics and protein synthesis mechanisms in vitro.</li>
</ul>
<h3>Precautions</h3>
<p>Store under inert atmosphere at -20°C to prevent hydrolysis. Handle with appropriate PPE to avoid skin contact. Not intended for direct human therapeutic use; strictly for laboratory research and quality control applications only.</p>