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Databases for Chemists and Chemical Engineers

Chemical Abstracts

SciFinder Scholar | CAS Online | Standard Abbreviations | Index Guide | Guide to CASREACT | Structure Searching with STN Express

Structure searching in CAS Online using STN Express: An introductory workshop

Types of structure searches

Type of Substance Retrieved Exact Family Sub-structure (SSS)
Structure with no additional substitution X X X
Radiolabeled forms of the substance X X X
Steroisomers X X X
Homopolymers X X X
Free radicals X X X
Charged compounds X X X
Salts and mixtures X X
Addition compounds X X
Copolymers X X
Structures with additional substitution X

A fourth type of structure search is also available.

Closed substructure searches (CSS)

  • Substance search which matches exactly a query and which contains system-defined variables.
  • No further substitution is allowed except where specified.

Last modified: June 22, 2005

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