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New on STN

January 2020

Changes to Derwent WPI Update numbering and the total number of annual DWPI updates

December 2019

Derwent World Patents Index: Manual Code revision 2020

December 2019

New Korean Patent Full-Text Database KRFULL released

STN User Meetings

Munich, 20.05.2020

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 Summary Sheet


Producer:Chemical Abstracts Service (CAS), USA
Coverage:Substances indexed in LCA and LCASREACT files
File Size:124,578 records
Updates:Static file
File Type:Numeric, Structure, Learning
Content:Chemical substances

LREGISTRY is a training database for the REGISTRY/ZREGISTRY  files. It is a chemical structure and dictionary database that contains approximately 125,000 substance records for compounds identified by the Chemical Abstracts Service (CAS) Registry System. These records are for the substances indexed in the LCA file and the LCASREACT file. All substance records contain a unique CAS Registry Number® and index name. Substance records may also have synonyms, molecular formulas, alloy composition tables, classes for polymers, nucleic acid and protein sequences, and structure diagrams, all of which are searchable and displayable.


Chemical Abstracts Service
2540 Olentangy River Road
P. O. Box 3012
Columbus, Ohio 43210-0012
Phone: (+1) 614-447-3600
Fax: (+1) 614-447-3798
Email: help(at)cas(dot)org

Usage Terms

The CAS Information Use Policies which apply to your use of the LREGISTRY File on STN are explained in detail.

Contents of CAS Information Use Policies

Part 1:
I. Introduction
II. Definitions

Part 2:
III. Authorized Use of CAS Information

Part 3:
IV. Unauthorized Use of CAS Information
V. Special Permission
VI. Further Information

Further details on the STN Information Keep & Share Program.