默克索引
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默克索引（Merck Index）是由美国默克公司出版的记录化学药品、药物和生理性物质的综合性百科全书，可查询CAS号、化学式、分子量、结构式，熔点、沸点等化学信息。
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The Merck Index is an authoritative source of information on chemicals, drugs, and biological substances. It provides comprehensive data on over 10,000 substances, including their physical and chemical properties, biological activities, and uses. The Merck Index is an essential resource for scientists, researchers, and anyone who needs information on chemical substances.