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• MARPAT (Markush Structures)
• CAS Database Content at a Glance

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CAS Databases

The most authoritative and comprehensive source for chemical information

CAS monitors, indexes, and abstracts the world's chemistry-related literature and patents, updates this information daily, and makes it accessible through state-of-the-art information services.

CAS databases offer many scientific disciplines, including biomedical sciences, chemistry, engineering, materials science, agricultural science, and more!

An integrated chemical and scientific resource of journals, patents, and reputable web sources

CAS databases provide millions of journal article references from more than 10,000 major scientific journals worldwide, patent and patent family references from 61 patent authorities around the world, and other reputable web sources.

The most timely scientific information source

• The CAS REGISTRY^SM database - the original source and final authority for CAS Registry Numbers (CASRNs or CAS Numbers) - is updated daily.
• All patent records, meeting CAS selection criteria, from 9 of the major patent offices are available online in CAplus within 2 days of the patents' issuance and fully indexed by CAS scientists in less than 27 days from the date of issue.
• Daily updates to the CAplus^SM database add more than 3,000 records each day, totaling more than 32 million currently.
• Bibliographic information and abstracts for all articles in more than 1,500 core journals are added to CAplus within 7 days.

Intellectually analyzed content

Analyzed by CAS scientists who are experts in a variety of scientific disciplines, the CAS databases offer value-added content obtained from journals and patents:

• Concept information - important scientific concepts, e.g., diseases, processes, techniques, as well as a statement about the nature of the study
  
• Comprehensive substance information - specific, generic, prophetic, or Markush substances, trade names, trivial names, systematic names, synonyms, and molecular formulas

Links from references to electronic journal and patent documents

With any of our online products, you can link to thousands of electronic journals and patents - seamlessly.

• Links to cited references dating back to the beginning of the late 19th century
• Links to over 280 STM publishers and 6,700 unique journals
• Links to the full text of 2 major patent offices

You can access CAS databases through:

• STN
• SciFinder 
• Other products and services