Chemical Information Sources/SIRCh/Structure Searches

SIRCh: Selected Internet Resources for Chemistry

Free Web-Based Structure Searching

 * ChemSpider
 * PubChem Structure Search
 * Chemical Structure Lookup Service (CSLS: pronounced "sizzles")
 * eMolecules
 * ChemIDplus Advanced (National Library of Medicine)
 * Fisher Scientific
 * ChemBioFinder Searching (from CambridgeSoft Corporation)
 * Substructure Search of SRC's Pointer File (uses ChemS3)
 * Bioscreening.com database
 * R&D Chemicals

Biomolecular Sequence and Structure Searching

 * Entrez, the Life Sciences Search Engine (NCBI)
 * CAS Registry BLAST [PD]
 * Protein Sequences in the CAS Registry File on STN--Exact and Pattern Searching [PDF]
 * Nucleic Acid Sequences in the CAS Registry File on STN--Exact and Pattern Searching [PDF]
 * Protein Data Bank (PDB)
 * CATH (Class, Architecture, Topology, and Homologous Superfamily) Protein Structure Classification Database
 * SDSC Biology Workbench: The WorkBench allows biologists to search many popular protein and nucleic acid sequence databases. Database searching is integrated with access to a wide variety of analysis and modeling tools, all within a point and click interface that eliminates file format compatibility problems.
 * Algorithms & Thermodynamics for Nucleic Acid Folding, Hybridization & Melting Profile Prediction (Michael Zuker)
 * Sequence Searching of Proteins & Nucleic Acids

Chemical Structure Searching on STN and SciFinder

 * STN User Documentation (Complete List)
 * Before You Begin A Structure Search on STN
 * Tips for Building Structures for Substructure Searching
 * Stereoisomer Searching on STN (STN Quick Reference Card)
 * Structure Searching in CAS ONLINE Using STN Express: An Introductory Workshop (Grace Baysinger, Stanford University)

Beilstein

 * CrossFire Beilstein Structure Searching (Andrea Twiss-Brooks, University of Chicago)