The world's largest collection of publicly disclosed information on chemistry and related research
CAS content offers the most comprehensive, timely information pertaining to chemistry and related sciences covering a comprehensive range of scientific disciplines, including biomedical sciences, chemistry, engineering, materials science and agricultural science, among many others.
For more information, check out CAS content at a glance.
The greatest depth and breadth of information about chemistry and related sciences
Use STN's powerful command-line searching to find precisely what you need within the most comprehensive, timely information pertaining to chemistry and related sciences covering a comprehensive range of scientific disciplines, the CAS databases - CAS REGISTRYSM, CASM, CAPLUSSM, CASREACT®, CHEMCATS®, CHEMLIST®, CIN®, and MARPAT®.
CAS databases contain more than 71 million unique organic and inorganic chemical substances, such as alloys, coordination compounds, minerals, mixtures, polymers and salts, and more than 64 million sequences—more than any other database.
With worldwide coverage of more than 10,000 scientific journals and 63 patent authorities plus patent families, citations and more, the CAS databases provide unparalleled access to chemistry and other related scientific disciplines.
The most timely scientific information
CAS databases are your source for the most current scientific information:
CAS REGISTRY - the authoritative source for molecular substance information and CAS Registry Numbers® (CAS RNs or CAS Numbers) is updated daily.
Chemistry-related patents from nine major patent offices are available online in CAplus within two days of the patents' issuance and fully indexed by CAS scientists in 27 days or less from the date of issue.
CAplus is updated daily and has more than 37 million records.
Bibliographic information and abstracts for all articles in more than 1,500 core journals are added to CAplus within seven days.
Intellectually analyzed content
CAS editorial scientists build the highest quality and most up-to-date chemical databases in the world. Content includes:
Concept information - important scientific concepts, e.g., diseases, processes and techniques as well as a statement about the nature of the study
Comprehensive substance information - specific, generic, prophetic and Markush substances, trade names, trivial names, systematic names, synonyms and molecular formulas
CA Lexicon - built using queries that ensure comprehensive results
Search using the same terms by which CAS indexes chemistry in its databases
Ensures more precise answers
Helps users find the most relevant results among historical information
Links from references to electronic journal and patent documents and other reputable web sources
With CAS' powerful online information products, you can access the world’s largest collection of information on disclosed chemistry and related research.
Cited reference links dating back to the beginning of the late 19th century
Links to over 280 STM publishers and 6,700 unique journals via CAS Full Text Options
Links to the full text of five major patent offices via CAS Full Text Options
You can access CAS databases through: