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<h3>Overview</h3>
<p><strong>Methotrexate EP Impurity B</strong> (CAS 988-70-5) is a critical reference standard for quality control, defined by the European Pharmacopoeia as 2-amino-4-hydroxy-6-methylpteridine. It serves as an essential degradation product in the synthesis of methotrexate, utilized to validate purity profiles during pharmaceutical manufacturing.</p>
<h3>Application</h3>
<ul>
<li>Pharmaceutical R&D: Characterization of drug substance stability under stress conditions.</li>
<li>Quality Assurance: Calibration of HPLC systems for impurity quantification in bulk APIs.</li>
<li>Regulatory Compliance: Submission of analytical data to FDA and EMA for new drug applications.</li>
</ul>
<h3>Precautions</h3>
<p>Store at -20°C in a dry, inert atmosphere to prevent hydrolysis. Handle with appropriate PPE due to potential cytotoxicity; avoid inhalation or skin contact during weighing procedures.</p>