ChemSpider is a free access service providing a structure centric community for chemists. Providing access to millions of chemical structures and integration to a multitude of other online services ChemSpider is the richest single source of structure-based chemistry information.
ChemSpider is a chemistry search engine. It has been built with the intention of aggregating and indexing chemical structures and their associated information into a single searchable repository and make it available to everybody, at no charge.
ChemSpider is a value-added offering of publicly available chemical structures since many additional properties have been added to each of the chemical structures. ChemSpider offers the fastest chemical structure searches available online and delivered with the flexibility and usability necessary to encourage repeat usage. A quick browse of the manual will help understand how ChemSpider can be of value.