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RXNO: reaction ontologies

RXNO is the name reaction ontology. It contains more than 500 classes representing organic reactions such as the Diels–Alder cyclization.

MOP is the molecular process ontology. It contains the underlying molecular processes, for example cyclization, methylation and demethylation.

Both ontologies are stored as .obo and .owl files, both of which can be read by Protege (

You can browse the terms here: and here:

Instructions for adding new reactions

To add new reactions to RXNO follow the instructions below using the flowcharts provided in the documentation folder:

  1. Determine the "skeleton" using the skeleton flowchart.
  2. Go through the reaction flowchart to find the correct parent class for the new reaction that you would like to add.

Steps for release

  1. You will need to obtain a tool to convert OBO to OWL (or vice versa if you're editing the OWL), for example ROBOT, which is available here:
  2. java -jar robot.jar convert --input rxno.obo --output rxno.owl
  3. java -jar robot.jar convert --input mop.obo --output mop.owl
  4. (currently optional for various reasons) Check that the resulting files don't violate DL: java -jar robot.jar validate-profile --input rxno.owl --profile DL --output dl.txt
  5. java -jar robot.jar validate-profile --input mop.owl --profile DL --output dl.txt

Colin Batchelor