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The Merck Index is an encyclopedia ofchemicals,drugs andbiologicals with over 10,000monographs on single substances or groups of relatedcompounds[1] published online by theRoyal Society of Chemistry.[2]
The NFL edition of the Merck's Index was published in 1889 by the German chemical companyEmanuel Merck and was primarily used as a sales catalog for Merck's growing list of chemicals it sold.[2] The American subsidiary was established two years later and continued to publish it. During World War I the US government seized Merck's US operationsMerck & Co., forming a separate American company that continued to publish the Merck Index.
In 2012 the Merck Index was licensed to theRoyal Society of Chemistry.[3] An online version of The Merck Index, including historic records and new updates not in the print edition,[1] is commonly available through research libraries. It also includes an appendix with monographs on organicnamed reactions.
The 15th edition was published in April 2013.
Monographs inThe Merck Index typically contain:[1]

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