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What is the CAS Registry Number? Why do I need it?

Chemical Abstracts Service (CAS) has a  registry system  for all completely identified chemical compounds or substances. There are over 144 million chemical substances & sequences currently registered and 12,000 new substances are added every day!! Each individual chemical substance is assigned a CAS Registry Number which may be thought of as that substance's "Social Security number."  (For more information, see  What does a CAS Registry Number look like? )

The rules of chemical nomenclature frequently change and each chemical substance is liable to have several names: i.e. trade or brand name(s); generic or common name(s); trivial or semisystematic name(s); and systematic or IUPAC name(s). For example, Tylenol is a brand name for acetaminophen which is itself a trivial name. The systematic name for this analgesic compound is Acetamide, N-(4-hydroxyphenyl)-. Another systematic name for this same compound is 4'-Hydroxyacetanilide. There is just one  CAS registry number which is  103-90-2 . Even if other names are created for this compound, the registry number will remain unchanged. There is no structural significance to the registry number - it is simply an identifier.

The most efficient and complete way to search for chemical substances in the  Chemical Abstracts Online  database is to use the CAS registry number(s).   A registry number may be searched as if it were a word, i.e.,  s 103-90-2  will search for information on Tylenol.  See  Using Native Commands to Search Chemical Abstracts Online  for more information on searching techniques.

CAS registry numbers are found in several print and electronic sources. These sources should be consulted before you develop your search strategy for  Chemical Abstracts Online . It is a good idea to verify registry numbers found in sources not published by CAS. This is because the registry number could represent some other form of the compound (e.g., stereoisomer, salt, or an incompletely defined form) than the one you want. To verify the registry number, select the Registry File by typing   file reg   into the search box in  Chemical Abstracts Online .  Enter  s ###-##-#  into the search box (###-##-# is the registry number - fill in the digits for the compound of interest). Check the record retrieved and make certain it is the desired substance before you use it in searching  Chemical Abstracts Online .

If the substance retrieved is not the one you want or you cannot find the CAS registry number in any of the sources listed below, you may then search the Registry File by substance name or molecular formula. A structure search may be attempted if all else fails but this type of search is expensive and can be complicated.

General sources containing CAS Registry Numbers

• Chemical Abstracts Index Guide . Columbus, OH: Chemical Abstracts Service, 1967-96 (ref QD 1 A51) There is an  Index Guide  for each collective 5-year period of  Chemical Abstracts . The  Index Guide  is published every 18 months and cumulated at the end of each collective period.  This is the "authority" list for both the print and online versions of  Chemical Abstracts .
• CRC Handbook of Chemistry and Physics . Cleveland, OH: CRC Press, published annually (ref QD 65 H3) *Older editions are in circulating collection (QD 65 H3).
• Gardner, William,  Gardner's Chemical Synonyms and Trade Names , 11th ed. Brookfield, VT: Gower, 1999 (ref TP 9 G286 1999)
• Hawley, Gessner Goodrich, et al,  Hawley's Condensed Chemical Dictionary , 16h ed. Hoboken, New Jersey: John Wiley & Sons, Incorporated,  2016
• Howard, Philip H. & Neal, Michael,  Dictionary of Chemical Names and Synonyms , Boca Raton, FL: Lewis Publishers, 1992 (ref TP 9 H65 1992)
• Kirk-Othmer Encyclopedia of Chemical Technology , 5th ed. NY: Wiley, 2004-2007, 26 volumes plus supplements.
• Buyer's Guide for Chemicals A directory of suppliers of chemicals and chemical products. More than 295,000 products are searchable by product name. (http://www.buyersguidechem.de)
• ChemExper Chemical Directory You may search this database of "chemicals available in the world" by registry number, molecular formula or by chemical name or synonyms in different languages. (http://www.chemexper.com/)
• ChemSpider Claims to be the "the richest single source of structure-based chemistry information" covering over 25 million compounds from almost 400 sources. You may search by systematic name, synonym, trade name, CAS registry number, etc. and find a wealth of information, including the CAS registry number. (http://www.chemspider.com)
• NIST Chemistry WebBook A gateway to the data collections of the National Institute of Standards and Technology (NIST), you can search for data on specific compounds by name, chemical formula, CAS registry number, molecular weight, or selected ion energetics and spectral properties. (http://webbook.nist.gov/)
• WIKIPEDIA (http://wikipedia.org) - "The Free Encyclopedia" has articles on chemical compounds written by and for chemists. Articles usually include CAS registry number and structural diagrams as well as alternate names, identifiers and properties with links to other sources of information.

Chemical catalogs containing CAS Registry Numbers

• Aldrich Chemical Company,  Aldrich Chemistry : Handbook of Fine Chemicals , Milwaukee, WI: Sigma-Aldrich (ref TP 202 A38)
• Sigma Chemical Company,  Biochemicals, Reagents & Kits for Life Science Research , St. Louis, MO: Sigma Chemical Co. (ref TP 202 S54)
• Fisher Scientific You may search the Fisher Scientific chemical catalogs by chemical name, molecular formula, catalog number, or key word. Choose "Advanced Search" to get all of the search options. Contains over 2,400 chemicals and material safety data sheets (MSDS's). (https://www.fishersci.com)
• Spectrum Chemicals & Laboratory Products You may search Spectrum Chemicals by chemical name, keyword, CAS registry number, FEMA number, color index number, and molecular formula. (http://www.spectrumchemical.com/)
• WWW Chemicals Another searchable collection of chemical catalogs which may be searched by chemical name, CAS registry number, field of expertise, molecular formula, etc. (http://www.chem.com/catalogs/)

Inorganic and Organic Compounds containing CAS Registry Numbers

INORGANIC COMPOUNDS

• Dictionary of Inorganic Compounds , 1st ed. NY: Chapman and Hall, 1992 (ref QD 148 D53 1992) 5-volume set and 1st-2nd annual supplements.

ORGANIC COMPOUNDS

• CRC Handbook of Data on Organic Compounds , 2nd ed. Boca Raton, FL: CRC Press, 1989 (ref QD 257.7 H36 1989) 10 volume set.
• Dictionary of Organic Compounds , 5th ed. NY: Chapman and Hall, 1982 (ref QD 246 D5 1982) 7 volume set and 1st-10th annual supplements (1982-1992).
• Handbook of Physical Properties of Organic Chemicals ,   Boca Raton, FL: CRC Press, 1997  (ref  QD 257.7 H374 1997

Drugs and Biologically Important Compunds containing CAS Registry Numbers

• Merck Index , Rahway, NJ: Merck & Co., published every 7-8 years  (ref RS 51 M4)  Library has latest three editions.
• PubChem A set of three databases: PubChem Compound, PubChem Substance, and PubChem Bioassay. PubChem provides information on the biological activities of small molecules. Depending on the source of the data, the results can include registry numbers but may not identify them as such.(http://pubchem.ncbi.nlm.nih.gov/).

Pesticides containing CAS Registry Numbers

• Briggs, Shirley A.  Basic Guide to Pesticides: their characteristics and hazards,  Washington, DC: Hemisphere, 1992 (ref SB 951 B75 1992)
• Crop Protection Handbook , Willoughby, OH: Meister PubCo, published annually. HSU Library has 2005 edition. (ref S 633 A5)
• Montgomery, John H.  Agrochemicals Desk Reference , 2nd edition.  Boca Raton, FL: CRC Press, 1997 (ref TD 196 A34 M66 1997)
• Worthing, Charles R.  The Pesticide Manual , 9th ed. Surrey, UK: British Crop Protection Council, 1991 (ref SB 951 P434 1991)
• EXTOXNET (Extension Toxicology Network) - A cooperative effort of UC Davis, Oregon State University, Michigan State University, Cornell University, and the University of Idaho - contains over 130 Pesticide Information Profiles on specific pesticides. (http://ace.orst.edu/info/extoxnet/ghindex.html)
• National Pesticide Information Center (NPIC) NPIC's mission is "to serve as a source of factual, unbiased information on pesticide chemistry, toxicology, and environmental fate." In addition to other information, NPIC has "active ingredient" fact sheets. (http://npic.orst.edu)

Toxic or Hazardous Substances containing CAS Registry Numbers

• Beim, Howard J.   Rapid Guide to Hazardous Air Pollutants .  NY: Van Nostrand Reinhold, 1998 (ref TD 883.1 B37 1998)
• Book of Lists for Regulated Hazardous Substances , 10th ed. Rockville, MD: The Institutes, 2001 (ref TD 1032 B66 2001)
• Bretherick, L.,  Bretherick's Handbook of Reactive Chemical Hazards , 6th ed. Oxford ; Boston : Butterworth-Heinemann, 1999 (ref T 55.3 H3 B73 1999)
• Keith, Lawrence H. & Walker, Mary M.,  Handbook of Air Toxics: sampling, analysis, and properties . Boca Raton, FL: Lewis Publishers, 1995 (ref TD 890 K4 1995)
• Lewis, Richard J., Sr.,  Hazardous Chemicals Desk Reference,  5th ed. NY: Wiley, 2002  (ref T 55.3 H3 L49 2002)
• Lewis, Richard J., Sr., & Sax, N. Irving,  Sax's Dangerous Properties of Industrial Materials , 10th ed. NY: Wiley, 2000 (ref T55.3 H3 L494 2000) 3-volume set
• Mackay, Donald, et al,  Illustrated Handbook of Physical-Chemical Properties and Environmental Fate for Organic Chemicals . Boca Raton, FL: Lewis Publishers, 1992-1997 (ref TD 196 O73 M32 1992) 5-volume set
• Montgomery, John H. & Welkom, Linda M.,  Groundwater Chemicals Desk Reference , 3rd ed. Chelsea, MI: Lewis Publishers, 2000 (ref TD 426 M66 2000)
• National Institute for Occupational Safety and Health,  NIOSH Pocket Guide to Chemical Hazards . Cincinnati, OH: NIOSH, 1997 (Docs HE 20.7108:C42/997)
• Pohanish, Richard P.,  Wiley Guide to Chemical Incompatibilities , 2nd ed. Hoboken NJ: J. Wiley, 2003  (ref T 55.3 H3 P647 2003)
• Pohanish, Richard P.,  Rapid Guide to Hazardous Chemicals in the Environment . NY: Van Nostrand Reinhold, 1997  (ref RA 1226 P64 1997)
• Pohanish, Richard P.,   Sittig's Handbook of Toxic and Hazardous Chemicals and Carcinogens , 4th ed. Park Ridge, NJ: Noyes Publications, 2002 (ref RA 1215 .S58 2002) 2-volume set
• Proctor, Nick H.,  Proctor and Hughes' Chemical Hazards of the Workplace , 4th ed., NY: Van Nostrand Reinhold, 1996 (ref RA 1229 P76 1996)
• Sheftel, Victor O.,  Handbook of Toxic Properties of Monomers and Additives . Boca Raton, FL: Lewis Publishers, 1995  (ref RA 1242 P66 S54 1995)
• Shepard, Thomas H.,  Catalog of Teratogenic Agents , 11th ed. Baltimore, MD: Johns Hopkins University Press, 2004 (ref QM 691 S53 2004)
• Sittig, Marshall,  World-Wide Limits for Toxic and Hazardous Chemicals in Air, Water and Soil . Park Ridge, NJ: Noyes Publications, 1994 (ref RA 1229.5 S58 1994)
• Consumer Products Information Database Enter Products, Manufacturers, Chemicals, Product Categories and Product Types
• Material Safety Data Sheets A collection of sites where you can get MSDS's. Most of these sites are searchable by chemical name, manufacturer name, and/or CAS registry number.

Content Attribution

Some of the content of this page was created in another format by Sharon Chadwick, HSU Librarian, retired 06/2013. 

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Index of Chemical Abstracts Service Registry Numbers (CAS No.)

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Annual Report 2015

Program Highlights

Chemical abstracts service (cas), cas ― powering innovative solutions that enable breakthroughs and empower scientific discovery.

At Chemical Abstracts Service (CAS), a division of the American Chemical Society, scientists, technologists and business leaders continuously and passionately pursue new knowledge to fuel scientific discovery and empower innovation.

Dedicated to the ACS vision of improving people’s lives through the transforming power of chemistry, the CAS team of highly trained scientists finds, collects and organizes all publicly disclosed substance information, creating the world’s most reliable collection of content that is vital to innovation worldwide. CAS provides a suite of solutions relied on by researchers, patent professionals and decision-makers around the world that advance the scientific enterprise by enabling discovery and facilitating workflows.

Powerful new solutions fuel discoveries

CAS added several new solutions to its portfolio in 2015. 

• NCI™ Global provides regulatory information for organizations that manufacture, import, export or transport chemicals. Updated weekly, inventories and regulatory lists are organized by country, so users can get right to the information they need.
• PatentPak™ is a robust workflow solution designed to radically reduce time spent acquiring and searching through multiple patents to find vital chemistry. PatentPak allows researchers to instantly access full-text patents from major patent offices globally, rapidly find specific locations of chemical information within the patents and find equivalent patents in familiar languages with patent family connections. PatentPak is now available in SciFinder® and STN®.
• Enhancements to CHEMCATS® allow researchers to conveniently find chemicals for purchase from reputable chemical suppliers as part of their SciFinder search.

Authoritative content builds the foundation

More than 1,000 scientists around the world assemble, curate, and assure the quality of the CAS content, so researchers can efficiently and reliably explore the largest collection of disclosed chemical synthesis information from 1840 to the present. Consistent with past performance, CAS databases experienced robust growth, with more than 1.5 million patents, journal articles and other disclosed research sources added, for a new total of more than 42 million records available in the CAplus SM database. Updated daily, CAS added more than 1.7 million new single-step reactions to CASREACT®, with more than 85 million single- and multi-step reactions, plus synthetic preparations now available to researchers.

The CAS REGISTRY SM is the largest and most authoritative collection of chemical substance information available to researchers and covers 63 worldwide patent authorities. In addition to covering substances from journals and patents, CAS REGISTRY includes substances from chemical catalogs, worldwide governmental regulatory agencies and reputable web resources. In 2015, more than 13.5 million new substances were added to CAS REGISTRY, which now contains more than 105 million unique organic and inorganic substances. The 100 millionth CAS Registry Number® (CAS RN™ 1786400-23-4) was assigned June 29, 2015, from a substance reported in a World Intellectual Property Organization (WIPO) patent (WO 2015081280). The inventors from Coferon Inc. in Stony Brook, N.Y., claim the molecule is a novel therapeutic designed to treat acute myeloid leukemia.

CAS ensures comprehensive patent information within its databases, including multiple basics coverage from all covered authorities. Supplementing the disclosed chemistry added to CAS databases from document analysis, CHEMCATS®, the CAS chemical catalogs database, helps researchers more quickly locate the chemicals they need with direct access to hundreds of commercial chemical suppliers.

SciFinder provides the most relevant information solutions for scientists

Organizations around the globe rely on SciFinder for research discovery with access to comprehensive scientific information using an array of powerful tools that drive more confident research decisions. The world’s leading commercial, academic and government organizations recognize the value of ensuring unlimited access to SciFinder for their entire research teams spanning disciplines including chemistry, pharmaceutical, agrochemical, biotechnology research, and more.

In addition to making PatentPak available in SciFinder during 2015, CAS continued to add more content than any other scientific resource, enhanced the most frequently sought after physical properties and additional experimental procedures, and increased visibility of chemical suppliers.

The SciFinder Future Leaders program celebrated its sixth year in 2015, with 20 new students participating from 17 countries. New for 2015, CAS also hosted the first ever SciFinder Future Leaders alumni program, with all previous program participants invited to return to Columbus, Ohio for the event. SciFinder Future Leaders provides students and post doctorates with the exclusive opportunity to share their research experience with CAS scientists and each other, and to take part in the Fall ACS National Meeting. To date, the program has hosted more than 100 students and post doctorates from 50 countries.

STN delivers unique content, unparalleled search power and precision, and proven reliability for intellectual property professionals

As the premier single source for the world's disclosed scientific and technical research, intellectual property professionals and patent examiners at the world's major patent offices and research organizations rely on STN to answer business critical questions and make informed decisions. In 2015, new STN was enhanced with new biomedical content, including BIOSIS®, MEDLINE® and Embase®, as well as adding life science databases CABA and FSTA. New features and interface refinements also enhanced usability. A new release of BizInt Smart Charts for Patents was also integrated with new STN to enable more efficient, insightful reporting and analysis of search results.

Researchers around the world rely on CAS

CAS continued to invest in providing authoritative and innovative solutions dedicated to advancing the scientific enterprise. Investments in its strategic framework in 2015 added an innovation function to identify and prioritize new market opportunities, as well as a program management office to provide consistency across initiatives. Significant modernizations to CAS’s content and development architectures also poise CAS to more effectively support research now and into the future, and expansion of dedicated global representatives enhanced global customer support. With several new solutions planned for 2016 and beyond, CAS is continuously investing for the future.

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CAS Launches Free Online Database

Designed for the public, common chemistry offers information about nearly 8,000 chemicals of general interest, by sophie l. rovner, may 25, 2009 | a version of this story appeared in volume 87, issue 21.

• Music and chemistry—what’s the connection?
• Structures of new cancer drug candidates revealed
• Comment: ACS initiatives communicating chemistry’s value
• Kary Mullis dies at age 74
• Natto, a fermented soy dish, controls blood glucose

Chemical Abstracts Service (CAS), a division of the American Chemical Society, last week officially launched Common Chemistry , a free online database containing information on 7,800 chemicals of widespread and general interest as well as all 118 elements from the periodic table. CAS had previously introduced a test version of the site during the ACS national meeting in March.

Common Chemistry is primarily intended for the general public, including students, teachers, and the media, says Christine McCue, CAS vice president for marketing. Apart from some of the elements, the substances in Common Chemistry were selected because they had been cited 1,000 or more times in CAS databases. Common Chemistry compounds include, to take a few examples, creatine, a controversial muscle-building supplement; bisphenol A, an endocrine-disrupting monomer used for making food and beverage containers; benzoyl peroxide, an acne treatment; and resveratrol, a constituent of grapes and wine that is reputed to have beneficial health effects.

The database can be searched by chemical name or CAS Registry Number. Entries show a compound's Registry Number, molecular formula, and chemical structure; chemical names and synonyms; and a Wikipedia link if available, McCue says. The Common Chemistry database will be updated periodically and further Wikipedia links will be added when possible.

The Common Chemistry web site is the result of a collaboration between Wikipedia and CAS that began in 2008, after representatives of the online encyclopedia asked CAS for assistance in validating CAS Registry Numbers listed on Wikipedia's Chemistry Portal, McCue notes. "This collaboration is CAS' gesture to provide accurate chemical information and CAS Registry Numbers to the public, which is also in line with CAS' mission as a division of the American Chemical Society," she says.

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CAS REGISTRY®

CAS REGISTRY ® （即 CAS 物质合集）是全球科学家、制造商、监管机构和数据科学家所信赖的化学物质准确信息的权威资源。

准确化学名称、结构和 CAS 登记号 ® 的权威来源。

自 19 世纪初以来，在出版物中披露的 1.95 亿有机和无机物质，包括合金、配位化合物、矿物、混合物、聚合物和盐。

约 7,000 万种蛋白质和核酸序列

富集了约 80 亿个实验和预测的属性数据点和光谱。

每日更新数千种新物质，让您了解最新发现。

可链接到相关出版物、反应、化学品供应商、配方等，是 CAS 内容合集的一部分

什么是 CAS 登记号®

化学物质有许多不同的描述方式，包括分子式、化学结构、通用名、系统命名、常用名和商品名。 这种不明确和统一的情况可能会导致失利、延迟，甚至是安全问题。

CAS 登记号是特定物质的唯一且明确的标识符，可以用于明确的沟通，并在 CAS 科学家的帮助下，将有关该物质的所有可用数据和研究联系在一起。 在进行监管申请时，政府机构信赖 CAS 登记号用于物质识别，因为 CAS 登记号是唯一的，易于验证的并且国际认可的标准。

小分子发现创新正在加速步伐

美国化学文摘社开放抗病毒化合物数据集 全力支持 COVID-19 研究

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Finding and Verifying CAS Registry Numbers ® on STN ® — March 1993 —

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