InChI Tag: Multiple Component

6 posts

International chemical identifier for reactions (RInChI)


The Reaction InChI (RInChI) extends the idea of the InChI, which provides a unique descriptor of molecular structures, towards reactions. Prototype versions of the RInChI have been available since 2011. The frst ofcial release (RInChIV1.00), funded by the InChI Trust, is now available for download ( This release defnes the format and generates hashed representations (RInChIKeys) suitable for database and web operations. The RInChI provides a concise description of the key data in chemical processes, and facilitates the manipulation and analysis of reaction data.

Capturing mixture composition: an open machine-readable format for representing mixed substances

Abstract: We describe a file format that is designed to represent mixtures of compounds in a way that is fully machine readable. This Mixfile format is intended to fill the same role for substances that are composed of multiple components as the venerable Molfile does for specifying individual structures. This much needed datastructure is intended to replace current practices for communicating information about mixtures, which usually relies on human-readable text descriptions, drawing several species within a single molecular diagram, or mutually incompatible ad hoc solutions. We describe an open source software application for editing mixture files, which can also be used as web-ready tools for manipulating the file format. We also present a corpus of mixture examples, which we have extracted from collections of text-based descriptions. Furthermore, we present an early look at the proposed IUPAC Mixtures InChI specification, instances of which can be automatically generated using the Mixfile format as a precursor.

Many InChIs and quite some feat

Comprehensive 2015 article published in Springer’s Journal of Computer-Aided Molecular Design. Here is the abstract,

The IUPAC International Chemical Identifier (InChI) is a non-proprietary, international standard to represent chemical structures. It was conceived 15 years ago, and has been is use for 10 years. The InChI Trust is developing and improving on the current standard, further enabling the interlinking of chemical structures on the web. This mini-review looks at the widespread adoption of InChI in software and databases.

International Chemical Identifier for Reactions (RInChI)

This May 2018 open access Journal of Cheminformatics article by Guenter Grethe et al., describes the first official version (RInChI-V1.00) that was released in March of 2017 and is available for download at the InChI Trust (

RInChI provides a standard for the representation of chemical reactions . As different databases use different methods for representing chemical reactions the adoption of RInChI and the ability to transform other representations into RInChI should allow for more thorough discovery across different databases of information related to chemical reactions. This article discusses the layers of the RInChI, the InChIKey and the Web-InChIKey. It also describes generation of RInChI from RD and RXN files, and the generation of RXN from RInChI. A database of over a million RInChI at the University of Cambridge is also described, .