Inchi News

InChI News Archive

November 7, 2022: Planning a Full InChI Projects Review at Fall ACS 2023 in San Francisco

  • We are planning a full day review of all of the active InChI projects at the Fall 2023 ACS meeting in San Francisco. The InChI Review will take place on Saturday Aug 12, 2023. The location in San Francisco will be finalized on the coming weeks. It will be a hybrid meeting with remote participation.

    Each active Working Group will provide an update and an overview of future plans.

August 25, 2022: InChI in the Wild: Celebrating Over 20 years of InChI Development in Memory of InChI Developer Igor Pletnev

  • This symposium honoring the many contributions of Igor Pletnev to the InChI project was held as part of the ACS Chicago 2022 meeting on Sunday August 21. Also covered were many research and development efforts to extend the InChI standard into additional areas of chemistry. The slide decks for these presentations are now available here.

July 1, 2022: Research Assistant/Associate - Software Development Position Open

  • Professor Dr. Sonja Herres-Pawlis, Institute of Inorganic Chemistry at RWTH Aachen University, has announced an open Reseach Assisstant position. The work will include further development of the IUPAC International Chemical Identifier (InChI), documentation of the programming developments and testing of extensions. The research group investigates topics in bioinorganic chemistry, sustainable polymerization catalysis, coordination chemistry and catalytic applications.

    Positions have been filled.

June 16, 2022: The InChI Trust Session at the Fall 2022 ACS Meeting in Chicago

  • The InChI Trust has set up an all day session at the August 2022 ACS Meeting in Chicago. The session covered the InChI standard as well as many extensions to the standard that are under development. The details of the session can be found on the website here.

June 9, 2022: InChI Technical Sessions in Cambridge UK June 17-19

  • Technical sessions are being held in personal and virtually on June 17-19 for several if the extension projects for the InChI Standard. The topics to be covered include: organometallics and to make progress toward adding extended stereochemistry and tautomers.

    See the full agenda on this webpage.

April 25, 2022: SciFinder Adds InChI Key to Substance Searching

  • SciFinder Search Substances Expanded to Include Searching With InChI Key

    Chemicl Abstracts Service announced that they have added an Advanced Search Field to search substances by InChI Key to SciFinder. InChI Key was added to a new Chemical Identifier subsection along with Chemical Name. Multiple entries must be delimited by a comma, space, or semicolon.

April 7, 2022: InChI Days 2022 Symposium

  • Our InChI Days 2022 virtual symposium brought together much of the InChI development community to discuss directions and future evolution of the InChI Standard. While the InChI Standard is quite stable and used across much of the organic chemistry space, our symposium covered a wide and diverse suite of extensions being studied by working groups of experts in each area. Topics covered by these teams at our meeting included extended stereochemistry, extended tautomers, polymers, Markush/variable structures, mixtures, reactions, nanomamaterials, isotopologues and the use of QR codes. We have the slide decks from the sessions available on our website ( If you are interested in InChI or any of these extensions, sign up for our newsletter InChI OUTREACH: SUBSCRIBE to InChI OUTREACH.

March 24, 2022: Menu Items Under RESOURCES Expanded

  • Check out the items under the RESOURCES menu item from the upper right menu bar. We have expanded these to include:
    • OER - Open Educational Resources for InChI - devoted to the use of InChI with many tools and resources
    • Full Bibliography of articles about, referencing or use InChI
    • Selected articles focused on an Overview of InChI
    • Selected articles focused on Drug Discovery that include use of or reference to InChI
    • AI or Machine Learning papers that reference InChI
    • More general 'science' papers that reference InChI

March 17, 2022: Open InChI Days in final planning - register now

  • Open InChI Days 2022 will be held virtually on April 5-6, 2022. We are in the final planning stages with the Agenda. See the Agenda, more information and to register for the event on the event webpage: HERE. This will be a virtual meeting.

March 9, 2022: InChI Outreach issue 2 available

  • The InChI OUTREACH newsletter issue 2 is now available to VIEW.

March 3, 2022: InChI OUTREACH Newsletter Issue 2 will be available shortly

  • If you would like to be added to our InChI OUTREACH distribution list, CLICK HERE.

March 2, 2022: Open InChI Days 2022 - planned for April 5-6, 2022

  • The previously planned in person InChI Technical meeting for April is being moved to June 19-21. More information on that shortly. Open InChI Days 2022 will be held virtually on April 5-6 coverring current InChI topics. See more information HERE

February 12, 2022: InChI Trust Website Updated

  • The InChI Website has been updated and a number of new areas added:
    • a Working Group page with all the projects listed; a webpage for each Working Group
    • The Bibliography has been divided into 4 sections: 1: InChI overview; 2: code development; 3: drug discovery papers; 4: ML/AI or other scientific papers
    People overviews have been added: Board; InChI Team; Working Group Leaders and Members

November 15, 2021: First Issue of InChI OUTREACH Released

  • 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:

November 10, 2021: We sadly note the passing of Igor Pletnev

  • Igor Pletnev was the developer and caretaker of the InChI software algorithm for 15 years, first at NIST and then at the InChI Trust. Over the years Igor made great contributions to the InChI project. His knowledge of both chemistry and computer programming made him a unique person to carry out all these tasks while interacting with chemists around the world on an almost daily basis. While there were many demands on his work efforts with the InChI algorithm, Igor always was calm and friendly to all, a true professional at all times. He will be missed and dearly remembered for all of his outstanding work by all of us at InChI Trust and the global community of InChI developers and users.

September 1, 2021: New Team Members Added

  • 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 ( 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. (

    Rudy Potenzone ( 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. (

December 15, 2020: InChI Code Release 1.06

  • InChI v1.06 ( 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.

January 27, 2017: InChI 1.05 and Reaction InChI (RInChI) 1.0 Released

  • Version 1.05 of the InChI software was released, along with version 1.00 of the Reaction InChI (RInChI)

June 1, 2011: InChI 1.04 and the InChI Certification Suite Released

  • Version 1.04 of the InChI software was released as well as an InChI Certification Suite which is designed to check the correct installation of the InChI software. Certification logos for correct installations as well as InChI Trust member and supporter logos are provided by the InChI Trust.

July 1, 2009: The InChI Trust was formed

  • The InChI Trust was formed. The 2009 Board of Directors consists of 8 members: The Royal Society of Chemistry • Nature Publishing Group • Elsevier Properties SA • Thomson Reuters • John Wiley & Sons • FIZ CHEMIE • Taylor & Francis • IUPAC

January 6, 2009: Standard versions of InChI and the InChIKey released

  • Standard versions of InChI 1.02 and the InChIKey were released, which took the original algorithm with its many variable parameters and fixed them so that interoperability between databases and resources with InChIs could be achieved.02

June 3, 2008: InChIKey - a shorter hash key version of InChI

  • A shorter hash key version of InChI, known as InChIKey was developed by Igor Pletnev. This alternative format is much more suitable for use in search engines and offers many new possibilities for software applications.

August 1, 2006: InChI Version 1 Released

  • version 1 of the IUPAC International Chemical Identifier (InChI) was launched. The development and associated programming work was predominantly carried out by Dmitrii Tchekhovskoi.

June 1, 2001: IUPAC Chemical Identifier Project - InChI - Initiated

  • The IUPAC Chemical Identifier project began in collaboration with the US National Institute of Standards and Technology (NIST). The aim was to devise a computer based algorithm yielding a unique label for any chemical structure, regardless of how it was represented (on screen).

June 5, 2000: First Organizational Meeting for InChI

  • From a meeting with a wide range of users of chemical nomenclature including database providers, patent officials, international trade representatives, et al, under the direction of Alan McNaught, it was decided that InChI would be an IUPAC initiative to meet the needs of the chemical and related communities.

June 1, 1998: Initial Proposal for a Public Domain Structure Standard

  • Steve Heller initiated a proposal at the National Institute of Standards and Technology (NIST) for a public domain structure representation standard for the NIST databases, along with Steve Stein who was the initial designer and architect for the project.

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