Searching the Chemical Thesaurus

The Chemical Thesaurus is a controlled vocabulary of chemical and drug terms used to index documents for MEDLINE. Another name for the Chemical Thesaurus is Supplementary Concept Records.


Find Option

  1. Enter a word, phrase, or text string in the text box. Boolean operators (AND, OR, NOT) and wildcards (* $ ?) are permitted.

  2. Click the Find button to display a list of chemical substances.

  3. Click the Add button to select a substance from the list. The selected item is added to the text box at the bottom of the page.

  4. Click OK to transfer the item(s) to the search field on the General Search / Advanced Searh page.


About the Chemical Thesaurus

Click the Details icon to view Chemical Thesaurus details about a substance.

The Add button next to a term indicates that the term is a preferred term?

Every term in the Chemical Thesaurus has been mapped to one or more subject headings in the main MeSH Thesaurus. For example, CP 230821 has been mapped to the subject heading Anticholesteremic Agents. Often, the MeSH subject heading denotes the broad class of compounds to which the specific substance belongs.

After you click the Find button, the product displays a list of substances. A substance will be on the list if: 1) The search term matches the name or part of the name of a substance, or 2) The search term is found in any of the following fields on the details page for the substance:

  • Entry Term
  • Previous Indexing
  • Heading Mapped to
  • CAS Type 1 Name


See our Searching the Chemical Thesaurus (Details) help page for more information.