InChI: open-source chemical structure representation algorithm

Welcome to the InChI Trust Website

The International Chemical Identifier, or InChI, is an algorithm and formatting standard for describing and storing chemical structures. InChI enables the linking and interlinking of chemistry and chemical structures on the web and computer platforms.  By enhancing the discoverability of chemical structures, InChI advances the ‘FAIR Guiding Principles for scientific data management and stewardship’.  FAIR was published in 2016 to provide guidelines to improve the Findability, Accessibility, Interoperability, and Reuse of digital assets.  InChI provides ‘Findability’ for chemical structures.  The associated software components are non-proprietary and open source. Development continues by a broad community of scientists and developers, much of which is contributed by our sponsors and supporters.

IUPAC Division VII has established an InChI subcommittee to develop the scientific rules for representing defined chemical structures.  For specific areas of chemical structures (tautomers, inorganics, etc.) the subcommittee has established a number of Working Groups.  Most of the conceptual design and direction is decided by the IUPAC Working Groups which are made up of experts in the associated fields.  The Working Groups are extending the standard for areas of chemistry that are not yet handled by InChI.  More information on each of  the Working Groups is available here.

The InChI Trust is a UK charity that works to implement the rules developed and approved by IUPAC through the Working Groups.  The Trust also promotes the use of the IUPAC InChI algorithm. InChI with its associated InChIKey was developed as a non-proprietary international standard and has just celebrated its sixteenth anniversary. The Trust aims to develop and improve on the current InChI standard, further expanding its use with extended chemical and computational capabilities.

In Memory of Igor Vladimirovich Pletnev 

 

 

 

The International Chemical Identifier (InChI) is a character string generated by computer algorithm, originally developed by the International Union of Pure & Applied Chemistry (IUPAC).

InChI is used in by number of large chemical databases and software applications handling many millions of chemical structures. The InChI algorithm turns chemical structures into unique machine-readable strings of information.

  

  

  

 

 

What is InChI and InChI Key?



InChI News

InChI v1.06 (https://www.inchi-trust.org/downloads/) is now available. This new version includes pseudo-atoms, which have a variety of uses including an improved description of polymers. There are also various bug-fixes and technical changes which will be very useful for programmers but which will probably not be noticed by everyone who uses the code just to generate standard InChI. The initial work for contracts for organometallics, coordination compounds, inorganics, and extended tautomers has been completed and the working groups are now analyzing and discussing the resulting work to determine the next VU steps. 

The InChI Trust added two new positions to help advance the extension of the InChI code as well as its awareness and use across the community. 

  • Gerd Blanke (gerd@inchi-trust.org) is the Technical Director for the Trust. He is working closely with the working groups to help move the various activities to delivery in next versions of the code. Gerd has held senior positions in information technology and services across the research area of life science and chemical industry. His business development skills span chemical and bio informatics, databases, data analytics, business Intelligence, project management, and management. (https://www.linkedin.com/in/gerd-blanke-b13115).

 

  • Rudy Potenzone (rudy@inchi-trust.org) is the Director of Outreach and Marketing, including extensions to the website, a newsletter (InChI OUTREACH), and a program to reach out to potential new sponsors, developers and users.  Rudy is an accomplished executive with a proven track record of developing products for life science informatics, knowledge management, workflow systems and electronic lab notebooks.  (https://www.linkedin.com/in/rudypoten).



InChI OUTREACH

InChI OUTREACH  will be published on a regular basis every 2 to 3 months.  We will include the latest news, topics of interest, discussions on various aspects of InChI.  The first issue and a link to subscribe to future issues are available here:

LATEST ISSUE

SUBSCRIBE TO FUTURE ISSUES

 

 

 

About us

WHO ARE WE ?

The diverse group of scientists and developers that contribute to the InChI projects come from industry, academia and government. They participate in one or more of the following groups:

Board

Home Page – new


Recent Publications and Presentations (Full List)

Overview Papers  (Full List)

InChIs and Registry Numbers
Leigh, Jeffrey
J Cheminform 13 40 (2021).
DOI: https://doi.org/10.1515/ci.2012.34.6.23
The Status of the IUPAC InChI Chemical Structure Standard
Boucher, R.; Heller, S.; McNaught, A.
Chem Int 39 (3) 47–47 (2017).
DOI: https://doi.org/10.1515/ci-2017-0316
InChI, the IUPAC International Chemical Identifier.
Heller, Stephen R.; McNaught, Alan; Pletnev, Igor; Stein, Stephen; Tchekhovskoi, Dmitrii
J Cheminform 7 23 (2015).
DOI: https://www.doi.org/10.1186/s13321-015-0068-4

InChI Development Papers  (Full List)

InChI version 1.06: now more than 99.99% reliable.
Goodman, Jonathan M.; Pletnev, Igor; Thiessen, Paul; Bolton, Evan; Heller, Stephen R.
J Cheminform 13 40 (2021).
DOI: https://www.doi.org/10.1186/s13321-021-00517-z
Toward a Comprehensive Treatment of Tautomerism in Chemoinformatics Including in InChI V2.
Dhaked, Devendra K.; Ihlenfeldt, Wolf-Dietrich; Patel, Hitesh; Delannée, Victorien; Nicklaus, Marc C.
J Chem Inf Model 60 1253-1275 (2020).
DOI:
Capturing mixture composition: an open machine-readable format for representing mixed substances.
Clark, Alex M.; McEwen, Leah R.; Gedeck, Peter; Bunin, Barry A.
J Cheminform 11 33 (2019).
DOI: https://www.doi.org/10.1186/s13321-019-0357-4

AI and ML Papers  (Full List)

Computational methods on food contact chemicals: Big data and in silico screening on nuclear receptors family
Pietro Cozzini; Francesca Cavaliere; Giulia Spaggiari; Gianluca Morelli; Marco Riani
Chemosphere 292 (2022) 133422.
DOI: https://doi.org/10.1016/j.chemosphere.2021.133422
Dynamic Buffer Management in Massively Parallel Systems: A Case on GPUs
Minh Pham; Hao Li; Yongke Yuan; Chengcheng Mou; Kandethody Ramachandran; Zichen Xu; Yicheng Tu

DOI:
HyFactor: Hydrogen-count labelled graph-based defactorization Autoencoder
Tagir Akhmetshin; Arkadii Lin; Daniyar Mazitov; Evgenii Ziaikin; Timur Madzhidov; Alexandre Varnek

DOI:

Drug Discovery Papers (Full List)

InChI version 1.06: now more than 99.99% reliable.
Goodman, Jonathan M.; Pletnev, Igor; Thiessen, Paul; Bolton, Evan; Heller, Stephen R.
J Cheminform 13 40 (2021).
DOI: https://www.doi.org/10.1186/s13321-021-00517-z
Toward a Comprehensive Treatment of Tautomerism in Chemoinformatics Including in InChI V2.
Dhaked, Devendra K.; Ihlenfeldt, Wolf-Dietrich; Patel, Hitesh; Delannée, Victorien; Nicklaus, Marc C.
J Chem Inf Model 60 1253-1275 (2020).
DOI:
Capturing mixture composition: an open machine-readable format for representing mixed substances.
Clark, Alex M.; McEwen, Leah R.; Gedeck, Peter; Bunin, Barry A.
J Cheminform 11 33 (2019).
DOI: https://www.doi.org/10.1186/s13321-019-0357-4

InChI Resources

InChI Resource Description
InChI Trust Membership Information on the InChI Trust, Membership and its Benefits
Download InChI Links to download various InChI software tools
InChI Members InChI Trust Members and their participants
InChI Supporters Supporters of InChI
InChI and IUPAC Relationship between InChI, the InChI Trust and IUPAC
InChI Open Education Resource Resources for Academics on using and contributing to InChI
Contact Us Contact us with questions or more information