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<h3>Overview</h3>
<p>Fluorouracil (5-FU) is a pyrimidine analog antimetabolite synthesized via fluorination of uracil derivatives. Its molecular formula is <strong>C<sub>4</sub>H<sub>3</sub>FN<sub>2</sub>O<sub>2</sub></strong> with CAS No. <strong>51-21-8</strong>. This white crystalline powder acts as a cytotoxic agent by inhibiting thymidylate synthase.</p>
<h3>Application</h3>
<ul>
<li><strong>Oncology:</strong> First-line treatment for colorectal, breast, and gastric carcinomas.</li>
<li><strong>Dermatology:</strong> Topical therapy for actinic keratosis and superficial basal cell carcinoma.</li>
<li><strong>Research:</strong> Standard tool in biochemical studies regarding DNA/RNA synthesis inhibition.</li>
</ul>
<h3>Precautions</h3>
<p>Strictly regulated due to teratogenicity and severe myelosuppression risks. Requires storage in tightly sealed containers at 2-8°C away from light. Personnel must utilize full PPE including respirators and chemical-resistant gloves during handling.</p>