*The following content is generated by AI and is for reference only.
<h3>Overview</h3>
<p>Ethynyl Estradiol-2,4,16,16-d4 is a stable isotope-labeled internal standard for quantitative analysis of Ethinylestradiol. Synthesized via deuterium exchange, it ensures high precision in mass spectrometry. <strong>Molecular Formula</strong>: C<sub>18</sub>H<sub>18</sub>D<sub>4</sub>O<sub>2</sub>; <strong>CAS No.</strong>: 109875-34-5.</p>
<h3>Application</h3>
<ul>
<li>Pharmaceutical R&D: Quantitative validation of drug metabolites.</li>
<li>Clinical Toxicology: Precise measurement in human plasma and urine.</li>
<li>Quality Control: Reference standard for HPLC and LC-MS/MS assays.</li>
</ul>
<h3>Precautions</h3>
<p>Store at -20°C in desiccated conditions to prevent hydrolysis. Handle with appropriate PPE; avoid direct contact as it is a potent hormonal agent. Not intended for clinical administration.</p>