Sicherheitsdatenblätter Sigma - Aldrich [Datenbank]  

ChemSpider [Datenbank]  

ChemSpider is a free chemical structure database providing access to over 25 million structures, properties and associated information. By integrating and linking compounds from more than 400 data sources, ChemSpider enables researchers to discover the most comprehensive view of freely available chemical data from a single online search. ChemSpider builds on the collected sources by adding additional properties, related information and links back to original data sources. ChemSpider offers text and structure searching to find compounds of interest.