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Screenshot of the CAS Common Chemistry database with information about caffeine ().. A CAS Registry Number [1] (also referred to as CAS RN [2] or informally CAS Number) is a unique identification number, assigned by the Chemical Abstracts Service (CAS) in the US to every chemical substance described in the open scientific literature, in order to index the substance in the CAS Registry.
[15] CAS was an early leader in the use of computer technology to organize and disseminate information. [16] The CAS Chemical Registry System was introduced in 1965. CAS developed a unique registry number to identify chemical substances.
This is a list of CAS numbers by chemical formulas and chemical compounds, indexed by formula.The CAS number is a unique number applied to a specific chemical by the Chemical Abstracts Service (CAS).This list complements alternative listings to be found at list of inorganic compounds and glossary of chemical formulae
The CAS Registry is the world’s most comprehensive collection of chemical substances and the CAS Registry Number is the recognized global standard for chemical substance identification. CAS views Wikipedia as an important societal tool for the general public, and this collaboration with Wikipedia is in line with CAS’ mission as a Division ...
The relationship between a CAS Registry Number and an INCI name is not always one-to-one. In some cases, more than one INCI name may have the same CAS number, or more than one CAS number may apply to an INCI name. For example, the CAS number 1245638-61-2 has the CA Index Name of 2-Propenoic acid, reaction products with pentaerythritol.
The CAS Registry Number or the European Community number can be used to find substances in the online system. Other possible search terms include the international nonproprietary name (for pharmaceutical drugs ), the ISO common name (for agrochemicals ) or the IUPAC name .
InChIs differ from the widely used CAS registry numbers in three respects: firstly, they are freely usable and non-proprietary; secondly, they can be computed from structural information and do not have to be assigned by some organization; and thirdly, most of the information in an InChI is human readable (with practice).
Pages in category "Chemical articles with multiple CAS registry numbers" The following 200 pages are in this category, out of approximately 1,423 total. This list may not reflect recent changes .