ChemSpider is a free chemical structure database providing fast access to over 67 million structures, properties, and associated information. By integrating and linking compounds from hundreds of high-quality data sources, ChemSpider enables researchers to discover the most comprehensive view of freely available chemical data from a single online search. It is owned by the Royal Society of Chemistry. This is the home page of ChemSpider Questions a chemist might ask… What is the chemical strcture of Xylene? What is the melting point of n-heptanol? Chemically, what is phenolphthalein? What are the stereocenters of cholesterol? Where can I find publications about Xylene? What are the different trade names for cholesterol? What is the NMR spectrum of Asprin? We can find answers for all of these questions by using ChemSpider. By clicking "simple", "structure", "Advanced " we can search any molecule a...