Other meanings of PubChem
Chemistry & Bioinformatics
PubChem is an open chemistry database at the U.S. National Institutes of Health (NIH), operated by the National Center for Biotechnology Information (NCBI). It collects chemical information on small molecules, including their structures, properties, biological activities, and safety data, and makes it freely accessible to the public. As of 2024, PubChem contains over 100 million unique chemical structures and more than 300 million bioactivity results, making it one of the largest and most widely used chemical information resources in the world.1
PubChem was launched in 2004 as part of the NIH Molecular Libraries Roadmap Initiative, with the goal of providing a public repository for chemical information generated by high-throughput screening and other research. It is maintained by the National Center for Biotechnology Information (NCBI), a division of the National Library of Medicine, and is closely integrated with other NCBI databases such as PubMed and GenBank.2 The database was designed to support the scientific community by enabling the discovery of chemical probes and drug candidates, and it has since become a cornerstone of cheminformatics and drug discovery research.
PubChem aggregates data from over 800 data sources, including government agencies, academic institutions, and industry partners. Key contributors include the U.S. Environmental Protection Agency (EPA) through its ToxCast and CompTox programs, the National Institute of Standards and Technology (NIST), and the European Chemicals Agency (ECHA).3 Each record includes chemical structure, molecular formula, synonyms, physical properties, and links to related literature and biological assays. The database also houses experimental and predicted toxicity data, making it a valuable resource for environmental health and safety assessments.
PubChem offers a suite of web-based tools for searching, analyzing, and downloading chemical data. Users can search by name, structure, or identifier, and use the PUG-REST API for programmatic access, which is widely used in bioinformatics pipelines.4 The platform also provides a 3D conformer viewer, a chemical structure editor, and a similarity search tool. These features enable researchers to perform virtual screening, identify potential drug candidates, and compare chemical properties across large datasets.
Beyond its primary role as a chemical database, PubChem has several lesser-known facets. It hosts a dedicated section for PubChem Substance and PubChem Compound, which separate raw depositor data from curated chemical structures, allowing for traceability and quality control.5 PubChem also integrates with the PubChem BioAssay database, which stores results from millions of biological experiments, including those from the NIH's Molecular Libraries Program. Additionally, PubChem supports the PubChemRDF format, enabling semantic web applications and linked data integration. The database has been used in unexpected ways, such as in forensic science for identifying unknown substances and in educational settings for teaching chemistry concepts.
All data as of 2024; PubChem continues to grow with contributions from the global scientific community.
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