ChemSpider is a chemistry search engine built with the intention of aggregating and indexing chemical structures and their associated information into a single searchable repository and making it available to everybody, at no charge. ChemSp...
Free chemical structure search engine. Millions of public domain structures. Very fast substructure searching. Results link to data about these structures.
Chembank is a public, web-based informatics environment created by the Broad Chemical Biology program and funded in large part by the National Cancer Institute Initiative for Chemical Genetics (ICG). This environment includes a freely avail...
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