Chemicals & Bioassays


Database that groups biomedical literature, small molecules, and sequence data in terms of biological relationships.

Computational Resources from NCBI's Structure Group

A centralized page providing access and links to resources developed by the Structure Group of the NCBI Computational Biology Branch (CBB). These resources cover databases and tools to help in the study of macromolecular structures, conserved domains and protein classification, small molecules and their biological activity, and biological pathways and systems.

Consists of deposited bioactivity data and descriptions of bioactivity assays used to screen the chemical substances contained in the PubChem Substance database, including descriptions of the conditions and the readouts (bioactivity levels) specific to the screening procedure.

Contains unique, validated chemical structures (small molecules) that can be searched using names, synonyms or keywords. The compound records may link to more than one PubChem Substance record if different depositors supplied the same structure. These Compound records reflect validated chemical depiction information provided to describe substances in PubChem Substance. Structures stored within PubChem Compounds are pre-clustered and cross-referenced by identity and similarity groups. Additionally, calculated properties and descriptors are available for searching and filtering of chemical structures.

PubChem Substance records contain substance information electronically submitted to PubChem by depositors. This includes any chemical structure information submitted, as well as chemical names, comments, and links to the depositor's web site.


FTP: PubChem

This site provides data from the PubChem Substance, Compound and Bioassay databases for download via ftp. Full downloads of the databases are available along with daily, weekly and monthly updates for Substance and Compound. Substance and Compound data are provided in ASN.1, SDF and XML formats. See the README files for more information.

PubChem Download Service

This service allows users to download compound or substance records corresponding to a set of PubChem identifiers, which can be supplied manually or through a text file. Numerous download formats are available, including SDF, XML and SMILES.


PubChem Upload

This site enables users to submit data to the PubChem Substance and BioAssay databases, including chemical structures, experimental biological activity results, annotations, siRNA data and more. It can also be used to update previously submitted records.


BioAssay Services

Tools that summarize the biological test results in the PubChem database and provide alternative ways to view bioassay results and structure-activity relationships. Users also can download their analyses and data tables.

PubChem Power User Gateway (PUG)

PUG provides access to PubChem services via a programmatic interface. PUG allows users to download data, initiate chemical structure searches, standardize chemical structures and interact with the E-utilities. PUG can be accessed using either standard URLs or via SOAP.

PubChem Standardization Service

Standardization, in PubChem terminology, is the processing of chemical structures in the same way used to create PubChem Compound records from contributors' original structures. This service lets users see how PubChem would handle any structure they would like to submit.

PubChem Structure Search allows the PubChem Compound Database to be queried by chemical structure or chemical structure pattern. The PubChem Sketcher allows a query to be drawn manually. Users may also specify the structural query input by PubChem Compound Identifier (CID), SMILES, SMARTS, InChI, Molecular Formula, or by upload of a supported structure file format.