PubChem® is the world's largest collection of freely accessible chemical information. Search chemicals by name, molecular formula, structure, and other identifiers.

Learn about PubChem chemical database, browse or search the documentation and find PubChem staff contact information.

PubChem Structure Search allows the PubChem Compound Database to be queried by chemical structure or chemical structure pattern.

Learn about PubChem chemical database, browse or search the documentation and find PubChem staff contact information.

Since PubChem is an open archive accepting information from many sources about a given molecule, it is imperative to provide the end-user with an aggregated view of all that is known …

PubChem is providing this periodic table page in order to help navigate abundant chemical element data available in PubChem. When exploring the table or list views on this page, …

PubChem Quick Search accepts a wide variety of textual queries, including chemical names, synonyms, systematic nomenclature, biological terms, and descriptive keywords.

Browse PubChem data using a classification of interest, or search for PubChem records annotated with the desired classification/term such as phenylpropionate or DNA repair.

PubChem computes various properties of chemical structures. The property filter allows you to restrict the search to chemical structures with particular computed property ranges.

All or part of the data for an individual PubChem record may be downloaded in various file formats, using the Download button available on the top-right corner of a Compound …