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Higher system limits increase the power of STN substance-based searching

November  12th,   2010

Substance searchers on STN now have vastly enhanced searching power due to a recent increase in search limits in the CAS databases. The increased limits provide greater flexibility and efficiency in the substance-search processes.

  • The iteration and answer limits for CAS REGISTRY structure searching are increasing from  
    • 2 million to 6 million for online searches
    • 3 million to 8 million for batch searches

REGISTRY iteration and answer limits



Online searches

2 million

6 million

Batch searches

3 million

8 million

  • The current accession number crossover limit from MARPAT to and from the CA/CAplus databases is doubling from 50,000 to 100,000.

MARPAT crossover limits





The increase in system limits will permit broader REGISTRY structure searches to run to completion, increasing search power and efficiency. Enhanced crossover limits allow increased flexibility as searchers move between key STN data sources.

About CAS

Chemical Abstracts Service (CAS), a division of the American Chemical Society, is the world's authority for chemical information and related solutions. Dedicated to the ACS vision of improving people's lives through the transforming power of chemistry, the CAS team of highly trained scientists finds, collects and organizes all publicly disclosed substance information, creating the world's most valuable collection of content that is vital to innovation worldwide. Scientific researchers and patent professionals around the world rely on a suite of research solutions from CAS that enable discovery and facilitate workflows.

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