Introduction to Searching

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When you log in to CAS SciFinder, search options are presented at the top of the Home page. (You can click the CAS SciFinder logo to return to the Home page at any time.)

  1. Select the search type:


    All finds substances, reactions, references, and suppliers that match your query. You can enter search terms that identify the subject of interest (e.g., keyword, research topic, document identifier, patent information, substance name, CAS Registry Number) or draw/import a structure query. See All Search.


    Find substances by search terms, a chemical structure, or both.


    Find reactions by substance name, CAS Registry Number, reaction number, and document identifier (e.g., patent number) or chemical structure that identifies a substance that participates in the reaction.


    Find references by search terms, a chemical structure, or both.


    Find suppliers by substance name or CAS Registry Number or chemical structure.


    CAS Lexicon

    Searching the CAS Lexicon helps you find the CA indexing terms for concepts, chemical classes, and taxonomic vocabulary. By viewing and selecting CA Concepts and other related Concepts, you can pinpoint your reference search.


    Perform a retrosynthetic analysis on a drawn or imported target structure using the Retrosynthesis search type or substance window.

    CAS Sequences

    Find BLAST, CDR, and Motif biosequences by protein/nucleotide string or a.txt/.fasta file.

  2. Enter a text query or click the Draw button to import a structure with CAS Draw, ChemDoodle, or ChemDraw or draw a structure query using CAS Draw or ChemDoodle.


  3. Click the magnifying glass to submit the query.


Recent Searches

When a search is completed, the query is displayed in the Recent Search History section of the Home page. Use the options to Edit the query or Rerun Search.

Click View All Search History to open the Search History page.