Registry File

Registry File. This CAS file contains more than 11.8 million chemical substance records. About 8,000—14,000 records are added each week as new substances are identified by the CAS Registry System. The substance records contain CAS Registry Numbers, chemical names, stmctures, molecular formulas, ring data biosequence information, and classes for polymers. AH of this information may be displayed. 

A number of files under the generic tide CAS ONLINE are available on-line on STN International. The system software, MESSENGER, includes chemical substmcture, text, and numeric data searching facHities. Chemical stmctures and Registry Numbers are contained in the CA Registry file. The four ways to search the stmctures are EXA, EAM, SSS, and CSS. 

Description, Acquisition, Retrieval, and Correlation File. This is the only other pubhc substmcture search system, apart from CAS Online, that provides full access to the CAS Chemical Registry File. The DARC file, commercially available on-line from Telesystems-Questel, offered the first pubhc on-line implementation of substmctural searching of the CAS Chemical Registry System. The advantages and disadvantages of the CAS Online and DARC systems have been discussed (49). 

FIGURE A.l Steps in building the structure of 3-ethylpiperidine in the Registry File. Above each structure is the conunand that gave that structure. 

The system asks for the desired scope, because a full search (of the entire Registry File of > 10 million substances) may cost a lot of money and may not be worth it if the desired answers can be obtained from a more limited search. 

It is not necessary to build stmctures to use the Registry File. Compounds can also be searched for by using names, combinations of name fragments. Registry Numbers, molecular formulas, and in other ways. The display methods are the same. 

Chemical Abstract Service. 2000. Chemical Abstract Service Registry File Data Bank. December,... 

CAS. 1988. Chemical Abstract Services Online Registry File. Decembers, 1988. 

Figure 16.1 illustrates the process we recommend for obtaining chemical property data [5]. Assessors usually start with a chemical name or synonym, Chemical Abstracts Service (CAS) Registry Number, and/or the chemical structure. The first task is to confirm the identification and structure of the chemical of interest. The largest (over 30 million chemicals) and most authoritative, but a relatively expensive source of chemical identification information is the Chemical Registry file of the American Chemical Society. However, there are several... 

Databases include the Beilstein File, the Gmeliu File, the Registry File, the Description. Acquisition. Retrieval, and Correlation File, and Ihc Structure and Nomenclature Search System. 

CA Registry File CAS Orbit (dictionary), Dialog (dictionary), Questel (dictionary and structure), STN dictionary and structure) chemical substance information and identification... 

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