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New on STN

October 2019

Third 2019 update to Emtree(TM) now available on STN(R)

October 2019

New CAS FORMULATIONS TM Database Launched on STNext

April 2019

New legal status codes for US patent applications and granted patents in INPADOC

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Bund Deutscher Patentanwälte - Herbstseminar, 10.-11.Okt, Dresden
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STN User Meetings

Hamburg, 23.10.2019
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 Summary Sheet


Producer:Chemical Abstracts Service (CAS), U.S.A.
Coverage:1907 to the present
File Size:More than 92.2 million records, including over 59.7 million sequences (5/2007)
File Type:Structure
Content:Chemical substances

ZREGISTRY has zero connect hour pricing.

The ZREGISTRY is a substance database containing records for substances identified by the Chemical Abstracts Service (CAS) Registry System. These include substances indexed in CAplusSM, CASM, and CAOLDSM files, and special registrations, for example, registrations for regulatory lists such as TSCA and EINECS.

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, ring analysis data, and structure diagrams, all of which are searchable and displayable. In addition to substance information, ZREGISTRY records contain super roles and document type information from CAplus, experimental and predicted (calculated) property data as well as tags pointing to references containing experimental property data.

Also displayable in the ZREGISTRY File are the 10 most recent CA references citing the substance since 1907, the total number of records citing the substance in the CAplus, CA, and CAOLD, and the total number of records in the CA File for the non-specific derivatives.

LREGISTRY is the companion training file for learning how to use the ZREGISTRY File.

Left truncation is available in the Chemical Name Segment (/CNS), Editor Note (/ENTE), and Notes (/NTE) fields.


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 ZREGISTRY 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.