October 20, 2014
September 16, 2014
A revamped PubChem Compound Summary page is now available. Technology has advanced considerably since the last major update in 2011, so this page was given a substantial makeover. Detailed information on the new PubChem Compound Summary page is provided in the PubChem Blog
July 25, 2014
PubChem celebrates 10 years of service to the chemical biology community! With humble beginnings, PubChem was first launched in Sep. 16, 2004. Through this time, PubChem’s focus has remained the same: to provide comprehensive information on the biological activities of chemical substances. To read more about this, visit the PubChem Blog
June 26, 2014
Why contribute your data to PubChem
? Maximize the impact of your research. Crosslink your data to key scientific databases. Satisfy data sharing requirements by journals and funding agencies. Flexibility on when your data gets released. Ability to share on-hold data with reviewers and collaborators. To learn more about these, visit the
January 30, 2014
November 21, 2013
September 3, 2013
PubChem Upload 1.0f is released! Adding your information to PubChem (https://pubchem.ncbi.nlm.nih.gov/upload/
) is now easier than ever. The new PubChem Upload system offers streamlined procedures for data submissions and includes an extensive set of wizards, inline help tips, and templates to assist users. Visit the PubChem Blog (http://1.usa.gov/1ayl7ze
) to read more about it.
April 8, 2013
April 8, 2013
are now available in PubChem. UniCarbKB is an initiative to create an online information storage and search platform for glycomics and glycobiology research. UniCarbKB curates information from the scientific literature on glycoprotein derived glycan structures, building on previous curation efforts by GlycoSuiteDB and continuing the principles of EUROCarbDB to provide an open-access platform for glycoinformatics. This is the first phase in the release of structures from UniCarbKB and the entries will be updated as the UniCarbKB structure database develops.
April 5, 2013
April 5, 2013
A new PubChem Upload
system offers streamlined procedures for data submissions and updates to both the PubChem Substance and BioAssay databases! This system is currently in Beta release, but will eventually replace the original Pubchem Deposition Gateway
. The new capabilities offered by PubChem Upload include:
- Assay & Substance wizards assist novice users
- UI speed greatly improved with newer web technology (minimizing possible time-outs)
- Easy new user registration/easy upgrade to production account
- Improved help, including hints built into user interface and tutorial
- Substance input with CID, SID, SMILES, etc.
- Select PubChem substances/assays as templates for new submissions or for record updates
- Error display integrated with substance list display
- Full editing and integration of assay data & description tables
- Expanded import/export handling of spreadsheets for data & description tables
Pubchem BioAssay DataDicer
January 23, 2013
: a new, efficient search engine for BioAssay outcomes, is now available at #
The PubChem DataDicer allows both novice and expert scientists to search and subset the greater than 200 million BioAssay outcomes from the PubChem BioAssay database. Users can query by molecular descriptors, genes, pathways, bioassay categories and other data types, in order to retrieve bioactivity outcomes for genes/proteins that were the targets of bioassays, or for small molecules that were screened in the bioassays. The data are linked to multiple NCBI databases, allowing you to traverse to the associated genes, proteins, chemical structures, and more. Data about outcomes, including small molecules, targets, and pathways can be downloaded to your computer as a comma-separated value (CSV) file.
Nearly 300,000 structures
database are now available in PubChem, including approximately 62,000 novel structures. All structures have links back to chemicalize.org data pages with predicted data including pKa, logP/D, names and identifiers, and more, all of which can be downloaded as structure data files (SDF). The announcement
from ChemAxon provides additional details.
December 10, 2012
October 5, 2012
More than 8 million structures
from the SureChem
patent chemistry database are now available in PubChem. SureChem has deposited chemistry for their complete collection of US, EP and WO full text patents from the 1976 to the present, after filtering out common chemicals, reactive groups and fragments. Over 4 million of these structures are new to the PubChem Compound database, significantly expanding public access to novel medicinal chemistry. Users can view the structures within the context of the patent by following the External ID link to SureChemOpen, a free patent chemistry search tool. A press release
from SureChem provides additional details.
October 1, 2012
Use the new PubChem Classification Browser
to browse PubChem data using a classification of interest, or to search for PubChem records annotated with the desired classification system and term. Illustrated examples
of search results for PubChem Compounds classified as methotrexate, and for PubChem BioAssays that tested protein targets involved in DNA repair, are available in the help document.
September 19, 2012
Show data your way with the new PubChem Widgets
. Display concise tables of patents, bioactivities, and literature for PubChem data in your web pages with three easy steps. See the help document
for details and examples of the data views available.
September 17, 2012
More than 6 million structures
are now available in PubChem. Extracted from the complex work units
of more than 300,000 USPTO
patents between the years of 2001-2012, these PubChem Substance records link to both SCRIPDB and the USPTO websites. A full text article
describing the SCRIPDB project is available in PubMed Central.
PubChem databases and services are now Hypertext Transfer Protocol Secure (HTTPS) compatible, allowing one to use encryption in their interactions with PubChem.
September 13, 2012
September 12, 2012
provides technical specifications for the syntax of HTTP requests and the available functions, and a new tutorial
provides some examples on how PUG REST can be used. PUG REST 1.0 replaces the April 2012 beta release and represents the stable final form of the tool. While new features may be still added, changes will be backward-compatible.
PubChem reaches milestones on 8th birthday! More than 100 million live records are now available in PubChem Substance, and nearly 200 million outcomes are available in PubChem BioAssay, representing contributions from more than 200 depositors that have joined the PubChem project since its launch on September 16, 2004.
June 5, 2012
April 24, 2012
The PubChem BioAssay summary pages now display the Gene Ontology (GO)
classification of the gene/protein target(s) that were tested by the bioassay. The GO terms are associated with each gene/protein in an automated way as part of the biosystems database data processing procedures, using the method
described in the Biosystems help document. All GO terms that apply to the gene(s)/protein(s) tested by the bioassay are shown in the GO hierarchy, including: (1) biological processes, (2) cellular components, and (3) molecular functions. Clicking on any GO term in the hierarchy will retrieve all bioassays that have tested a protein(s) associated with that term. As an example, see the GO terms for the protein target that was tested by the glucocorticoid receptor (GR) redistribution assay (AID 450
In addition, the PubChem BioAssay data summary for a compound now displays a graphical summary of the bioassays that have tested the compound, categorizing the bioassays by: (1) bioactivity outcomes (active, inactive, inconclusive, unspecified); (2) top targets; (3) bioactivity types (IC50, EC50, Potency, Ki, etc.); (4) bioassay types (screening, confirmatory, summary, other). The bar graphs are clickable and serve as filters to display data from the selected category, refreshing both the bar graphs and the tabular summary of bioassays to reflect the data subset you have selected. As an example, see the bioassay data summary for aspirin (CID 2244
Feburary 21, 2012
PubChem PUG REST - a RESTful web interface to PubChem data and services. Documentation and examples are available at
. This service is considered to be in a beta state right now, meaning it is under active development and some changes may occur but the interface should be mostly stable. The purpose of this beta release is to make some basic functionality available now, and to invite feedback from the PubChem user community. Please try it out and tell us what you think; contact
with questions, problems, or suggestions for new features.
from the Therapeutic Target Database (TTD)
are now available in PubChem.
Therapeutic Target Database (TTD) is a database to provide information about the known and explored therapeutic protein and nucleic acid targets, the targeted disease, pathway information and the corresponding drugs directed at each of these targets. Also included in this database are links to relevant databases containing information about target function, sequence, 3D structure, ligand binding properties, enzyme nomenclature and drug structure, therapeutic class, clinical development status. All information provided are fully referenced.
December 8, 2011
October 4, 2011
October 3, 2011
PubChem updated the compound and substance summary pages to load faster, to include dramatically expanded
biomedical annotation, and to give an updated look and feel. For example, the PubChem Compound summary page for
aspirin (CID 2244)
August 12, 2011
A new layer called PubChem3D is added to PubChem to assist with interrelating diverse chemical structures with similar biological efficacies against targets. As a part of this, PubChem computes a 3-D conformer model description for records in the PubChem Compound database when possible (92% of all records when considering the parent compound of salts). A pre-computed search per compound record gives immediate access to a set of 3-D similar compounds (called "Similar Conformers") in PubChem and their respective superpositions. Systematic augmentation of PubChem resources to include a 3-D layer provides users with new capabilities to search, subset, visualize, analyze, and download data. For additional information, please visit the PubChem3D thematic series with the (BMC) Journal of Cheminformatics: http://www.jcheminf.com/series/pubchem3d
PubChem's information content continues to increase. As of August, 2011, deposited substance records have reached 85 million, representing to over 30 million chemically unique compounds. Deposited bioassay records have reached 500 thousand, representing over 130 million experimental bioactivity results. New substance and bioassay records continue to be deposited, and the PubChem team expects that the steady growth in content and usage seen over the past 7 years will continue.
August 10, 2011
June 8, 2011
May 27, 2011
May 23, 2011
April 11, 2011
BioAssay data specification has been updated. The changes include:
- New units in PC-ResultType to facilitate DMPK data submission.
- A new element "type" in PC-AnnotatedXRef to record
primary citation to advertise primary publications of the depositors and the bioassay results.
- A new element "type" in PC-AssayDRAttr to record experimental vs. calculated
dose-response data points.
Please review the update at
March 17, 2011
PubChem released two new data analysis tools for
the bioassay services -
views for the
BioActivity Analysis service.
These new tools together with the original
allow users to explore bioactivity data from molecular target, chemical
structure, and biological experiment perspectives. For more information, see
in the help page.
March 15, 2011
February 22, 2011
February 7, 2011
February 4, 2011
January 19, 2011
January 13, 2011
assays have been updated and now point to substances deposited by ChEMBL requested by
January 11, 2011
The PubChem BioAssay ASN.1/XML data specification has been updated to include new types of target data
under PC-AssayTargetInfo and PC-ResultType. For more details, please refer to
December 20, 2010
December 16, 2010
November 10, 2010
November 1, 2010
October 29, 2010
October 8, 2010
September 3, 2010
The PubChem BioAssay FTP updated
September 3, 2010
To expedite the download speed for growing number of assays in the PubChem Bioassays FTP site, we have introduced several changes that may impact all of the BioAssay FTP users.
- Data and description files are now partitioned and compressed as "zip" format. Each compressed zip file contains a directory with a list of BioAssay files according to the range of AID(BioAssay ID), the directory named as the AID range, and each individual data filename prefixed by the AID. For example, the file "0000001_0001000.zip" contains the compressed zip archive directory which contains individual Bioassay files. Each Bioassay file contains an AID record within the range of 1 through 1,000.
- The files were partitioned according to a fixed AID range of 1000.
- The zip file format has been natively supported on Windows, Mac OS X, Linux, Unix and other systems. There are also a number of ZIP tools and libraries available and free for your programming environments.
September 3, 2010
The PubChem data specification updated
July 12, 2010
- ASN1/XML data specification for PubChem Substance has been modified to include XRef choices for cross-link to NCBI GEO database.
- ASN1/XML data specification for PubChem BioAssay has been modified to include "categorized-comment" field under PC-AssayDescription.
For more details, please refer to
June 30, 2010
June 21, 2010
June 7, 2010
June 4, 2010
May 29, 2010
May 28, 2010
May 24, 2010
May 20, 2010
April 27, 2010
April 21, 2010
April 13, 2010
March 5, 2010
February 19, 2010
December 15, 2009
November 23, 2009
October 30, 2009
September 30, 2009
PubChem Entrez displays now include a "Selected Records" panel to help users discover informative annotations and subsets among search results. For example, following a keyword search of PubChem Compound for "aspirin
", the "Selected Compounds" panel includes a line saying "Protein 3D Structures, Compound Count: 4." This indicates that 4 of the 85 compound records retrieved by the "aspirin" search were derived from Protein 3D structures. Clicking on "4" shows which 4 out of the 85 compounds were observed binding to proteins. Clicking on "Protein 3D Structures" shows the 20 experimental protein 3D structures observed to bind these compounds.
from the Ganolix
are now available in PubChem.
September 17, 2009
September 2, 2009
August 4, 2009
June 30, 2009
June 12, 2009
June 9, 2009
June 4, 2009
May 21, 2009
April 24, 2009
April 2, 2009
March 30, 2009
are now available in PubChem. Novo|seek is a search engine for biomedical literature in Medline and US Grants.
February 25, 2009
February 13, 2009
February 3, 2009
is released consisting of a single
theoretical 3D conformer per compound record and includes a new similarity
relationship (Similar Conformers).
is now updated to version 3.0 of the algorithm.
InChI and InChIKey
are now updated to use the
version 1.0.2 standard
November 28, 2008
November 26, 2008
November 20, 2008
November 7, 2008
The PubChem Score Matrix Service
, through which one can download similarity scores for selected lists of CIDs, is now released.
November 5, 2008
October 27, 2008
October 20, 2008
September 29, 2008
September 18, 2008
September 11, 2008
September 10, 2008
September 8, 2008
August 15, 2008
July 15, 2008
July 1, 2008
May 19, 2008
May 9, 2008
An open BETA test of PubChem's new PUG SOAP web services
available. Included are
sample interfaces for GUI workflow applications (Taverna, Pipeline
Pilot) and SOAP-aware programming and scripting languages (Java, C#, VB,
May 5, 2008
February 25, 2008
February 22, 2008
February 1, 2008
January 30, 2008
January 10, 2008
December 20, 2007
December 16, 2007
November 29, 2007
November 20, 2007
November 18, 2007
October 11, 2007
October 3, 2007
August 14, 2007
ORST Small Molecule Screening Center
are now available in PubChem.
August 6, 2007
July 18, 2007
June 6, 2007
, representing the specialty chemicals from its primary catalog, are now updated in PubChem.
PubChem Power User Gateway (PUG)
May 9, 2007
is released. PUG is an XML-based programmatic interface to PubChem that can perform structure searching and structure download. A SOAP-compliant wrapper is available.
April 11, 2007
March 6, 2007
November 14, 2006
November 8, 2006
PubChem Structure Search
v2.0 release.PubChem Structure-Activity Analysis and Structure Clustering tools release.
November 6, 2006
October 16, 2006
October 12, 2006
September 10, 2006
August 9, 2006
August 7, 2006
July 28, 2006
July 24, 2006
July 12, 2006
June 26, 2006
June 16, 2006
June 6, 2006
June 1, 2006
May 1, 2006
March 21, 2006
March 8, 2006
February 27, 2006
(Southern Research Institute Molecular Libraries Screening Center)
are now available in PubChem.
February 10, 2006
February 8, 2006
February 1, 2006
January 27, 2006
January 25, 2006
January 18, 2006
December 20, 2005
November 22, 2005
October 31, 2005
October 18, 2005
September 23, 2005
September 6, 2005
September 2, 2005
August 26, 2005
August 18, 2005
August 17, 2005
August 1, 2005
June 9, 2005
May 25, 2005
April 6, 2005
PubChem/Compound now provides improved linkage to Medical Subject Annotations and PubMed biomedical literature citations.
PubChem/Compound now contains unique structures only, and compound identifiers have changed. Please
update links to PubChem/Compound based on "cid" identifiers.
For additional information, click here
September 16, 2004
PubChem release. PubChem contains the chemical structures of small organic molecules and information on their biological activities.
For more information, go to PubChem