ChemSpider is a free chemical structure database providing fast text and structure search access to over 32 million structures from hundreds of Internet data sources. Provided by the Royal Society of Chemistry, it aggregates structures, spectra, properties, suppliers, syntheses, and other information into a single searchable repository with links back to the original sources. Data sources include PubMed, PubChem, NIST Chemistry WebBook, Google Books, and Google Patents. ChemSpider has won a number of awards. ChemSpider SyntheticPages, CS|SP, extends this model to cover reactions, providing quick publication, peer review and semantic enhancement of repeatable reactions.
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