PubChem is the world's largest collection of freely accessible chemical information. Search chemicals by name, molecular formula, structure, and other identifiers. Find chemical and physical properties, biological activities, safety and toxicity information, patents, …

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

An overview of search and other analysis capabilities in PubChem.

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

This document provides step-by-step instructions on how to explore data contained in PubChem, along with examples of commonly requested tasks.

PubChem Substance is the primary archive for community-provided information about chemical entities. A Substance record can contain chemical structures, synonyms, registration IDs, descriptions, related URLs, patent identifiers, cross-references to PubMed, and biological screening results, etc.

PubChem Compound records are derived summaries that give users access to a rich set of related content. Compound records contain unique chemical structures extracted from contributed Substance records through standardization.

PubChem homepage provides a quick search functionality allowing many different input types in a single search box and providing results accross multiple data collections.

Browse PubChem data using a classification of interest, or search for PubChem records annotated with the desired classification/term (e.g., MeSH: phenylpropionates, or Gene Ontology: DNA repair).

Learn about various options available for downloading PubChem data.