CAS is the only organization in the world whose objective is to find, collect and organize all publicly disclosed substance information.

We build and maintain the world's largest collection of molecular substances, reactions, and related content that is vital to the work of researchers.

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2014 Nobel Prize in Chemistry

CAS congratulates Eric Betzig, Stefan W. Hell and William E. Moerner, winners of the 2014 Nobel Prize in Chemistry.

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CAS and PerkinElmer collaborate to combine the power of two leading research solutions.

Latest Feature: Enzymatic Breakdown of Biomass

A look at recent patenting activity in Enzymatic Breakdown of Biomass.

Guess Who's In The Top 10

Learn about the top 10 highly cited journal articles in the CAS databases.

Precise and Professionally Indexed Content

We understand the difference people make to the scientific process.


SciFinder provides access to CAS content and delivers the information they need to:

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  • make better decisions

With SciFinder you get:

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at your fingertips than with any other source.

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The intuitive, award-winning application offers instant access to the most comprehensive collection of chemical substance and reaction information, and to more references than any other scientific search service.

Patent Experts 

Information professionals and patent searchers worldwide rely on STN as their scientific and technical resource of choice.

The world's major patent offices depend on
STN for:

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  • high-quality coverage

of science and intellectual property information.

STN provides access to key scientific and intellectual property databases and is the premier single source for the world's disclosed scientific and technical research.

STN is operated jointly by CAS and FIZ Karlsruhe worldwide and is represented in Japan by JAICI.


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A global team of scientists is continually adding substance information from the world's disclosed chemistry to the CAS REGISTRYSM, the gold standard for chemical substance information.


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