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

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.

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, …

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 …

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.

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 …

PubChem BioAssay contains small-molecule and RNAi screening data along with associated annotation information from contributing organizations.

This document describes the REST-style version of PUG (Power User Gateway), a web interface for accessing PubChem data and services. It details both the syntax of the HTTP requests, …