CAS Content at a Glance

CAS maintains counts of its database records to reflect their scope of coverage and to ensure that researchers have confidence in their comprehensiveness.

	Chemical SubstancesCAS REGISTRY^SM	ReferencesCAplus^SM	ReactionsCASREACT^®	Regulated chemicalsCHEMLIST^®	Chemical suppliersCHEMCATS^®	Chemical Industry NotesCIN^®	MarkushMARPAT^®
Number of references	>120 million organic and inorganic substances >66 million sequences (view latest numbers) How do we count	>43 million records How do we count	>91.6 million reactions (>77.5 million single- and multi-step reactions and >14 million synthetic preparations) How do we count	>346,000 inventoried or regulated chemicals How do we count	Millions of commercially available products Millions of unique CAS Registry Numbers How do we count	>1.7 million records How do we count	>1,134,000 searchable Markush structures >469,000 patent records How do we count
Content	Information about the many different types of substances, including Synonyms Molecular formulas Ring analysis data Structure diagrams Experimental and predicted property data Literature references	Chemistry and chemistry-related articles covering topics such as Proteomics Genomics Biochemistry Biochemical genetics Organic Macromolecular Applied Physical, inorganic, analytical	Reaction information consisting of Structure diagrams for reactants and products CAS Registry Numbers for all reactants, products, reagents, solvents, and catalysts Detailed reaction conditions Experimental procedures	Chemical substances that are regulated in key markets across the globe Chemical names Synonyms Regulatory lists Chemical inventory status	Information about commercially available chemicals and their suppliers: CAS Registry Number Supplier information Quantities Prices	Chemical industry trade publications including Abstracts Bibliographic information CAS Registry Numbers Chemical names	Markush structures of organic or organometallic molecules are searchable. Patent reference information is displayable.
Coverage	Substances from journal articles, patents, chemical catalogs, and reputable web sources from the early 1800s to present GenBank sequences Organic substances as well as - Alloys - Coordination compounds - Minerals - Mixtures - Polymers - Salts - Sequences - Organo- metallics - Proteins - Inorganic substances	Early 1800s to present Chemistry indexed from more than 50,000* scientific journals worldwide, with thousands of active titles currently covered Rapid analysis of more than 1,500 key chemical journals Patents from 63 patent authorities (see CAS Coverage of Patents) Conference proceedings Technical reports Books Dissertations Reviews Meeting abstracts Electronic-only journals Web preprints	1840 to present Reactions from journals, patents, and dissertations, as well as from evaluated reference works	1980 to present Originally from data in the 1985 TSCA inventory and supplements U.S. Government Federal Register International chemical regulations 16 national and international inventories State lists (view lists)	Hundreds of suppliers for commercial chemicals worldwide Chemical catalogs	1974 to present Worldwide chemical business needs Government publications Journals Newsletters Special reports Trade magazines	1961 to present Markush structure records for patents in CAplus from 1988 to present with selected coverage of English (1984-1987), French and German (1986-1987) and Japanese (1987) patents, including coverage of Russian patents after January 10, 2000 and Korean patents from 2008 to present INPI data from 1961-1987
Update Frequency	Daily	Daily	Daily	Weekly	Weekly	Weekly	Daily

*From 1907 to present, CAS has indexed chemistry from more than 50,000 journal titles. In that time, publishers have discontinued, merged, split, revised and changed the focus of many titles.

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CAS Content at a Glance