Ring Identification in CAS Registry
Shively, Eric (eshively@cas.org)
Fri, 15 Jan 1999 07:09:48 -0500
> There have been several postings recently regarding the use of ring
> identifiers for chemical patent searching in commercial databases.
> CAS has provided, and will continue to provide, ring identification
> codes (RID) for ring compounds as they are added to the CAS
> Registry File.
>
> Chemical substances with molecular structures are represented in the
> CAS Registry File by means of a single structural component in a
> single record. In some cases, e.g., molecular addition compounds,
> mixtures, and salts, two or more components are represented in a
> single record. A structural feature common to many of the
> components
> in the Registry File is the presence of one or more rings.
> Therefore,
> in addition to the CAS Registry Number, the structure diagram, one
> or
> more names, and molecular formula information, each ring-containing
> component also has associated ring data, such as terms describing
> the
> ring system or systems contained in a component's molecular
> structure. Ring data provide additional points that may be very
> useful in answering certain types of questions. Ring search fields
> can provide an effective means for creating a searchable subset of
> structures, describing ring systems in terms of elements, and more.
>
> The recently introduced REG1stRY feature in the CA and CAplus files
> on STN supports the direct search and retrieval of patent and
> journal
> references that cite substances containing a specified RID. A
> hypothetical search in the CAplus file is shown below:
>
> SEA 1938/RID/REG AND P/DT
>
> For more information on ring data in the Registry File please
> contact
> CAS Customer support at help@cas.org , or call 1-800-753-4227 (USA),
> 614-447-3700 (outside the USA).
>
> Leo W. Collins, Ph.D.
> CAS Registry Product Manager
>
>
> Phone: (614) 447-3600 x 3067
> Fax: (614) 461-7149
> email: lcollins@cas.org