*The following content is generated by AI and is for reference only.
<h3>Overview</h3>
<p>Tofacitinib Impurity 4 is a critical reference standard used in the quality control of <strong>Tofacitinib</strong>. It typically refers to a specific degradation product or synthetic intermediate. Its molecular formula is <strong>C21H29N7O</strong> and CAS number is <strong>1568000-93-2</strong>.</p>
<h3>Application</h3>
<ul>
<li><strong>Pharmaceutical Manufacturing</strong>: Used for method validation and impurity profiling during drug substance production.</li>
<li><strong>Regulatory Compliance</strong>: Essential for stability studies and meeting ICH Q3A/Q3B guidelines.</li>
<li><strong>R&D Analysis</strong>: Supports structural elucidation and purity assessment in new drug development.</li>
</ul>
<h3>Precautions</h3>
<p>Store in a cool, dry place under inert atmosphere away from light. Handle with appropriate PPE to avoid inhalation or skin contact. Not for clinical use; strictly for laboratory research and quality control purposes only.</p>