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Chemical Structure Lookup Service
Search in 74 million indexed structures from over 100 databases (46 million unique structures).
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ChemSpider
ChemSpider is a free chemical structure database providing fast text and structure search access to over 100 million structures from hundreds of data sources.
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CRC Handbook of Chemistry and Physics
The online version of the CRC Handbook of Chemistry and Physics. Contains the periodic table, basic constants and units and geophysical data.
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Protein Data Bank (RCSB PDB)
<span style="color: rgb(51, 51, 51); font-family: &quot;Helvetica Neue&quot;, Helvetica, Arial, sans-serif; font-size: 14px; background-color: rgb(255, 255, 255);">This resource is powered by the Protein Data Bank archive-information about the 3D shapes of proteins, nucleic acids, and complex assemblies that helps students and researchers understand all aspects of biomedicine and agriculture, from protein synthesis to health and disease.</span>
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PubChem
PubChem is an open chemistry database at the National Institutes of Health (NIH).