ChemSpider on ilmainen kemiallisten rakenteiden tietokanta, jossa voi tehdä teksti- ja rakennehakuja yli 30 miljoonasta rakenteesta.
ChemSpider is a free chemical structure database providing fast text and structure search access to over 30 million structures from hundreds of data sources. A keyword search is possible by compound chemical name or synonyms. Structure search support query input, SMILES/SMARTS, InChI, molecular formula, or SDF structure files. Structure search could be exact (identity), substructure, superstructure and similarity searches. A search query could be constructed as URL, without use a search form.