The Chemical Entities of Biological Interest (ChEBI) ontology is downloaded weekly from EMBL-EBI at http://www.ebi.ac.uk/chebi/. The data is made available under the Creative Commons License (CC BY 3.0, http://creativecommons.org/licenses/by/3.0/). For more information see: Degtyarenko et al. (2008) ChEBI: a database and ontology for chemical entities of biological interest. Nucleic Acids Res. 36, D344–D350.
A very long-chain omega-3 fatty acid that is tetracosanoic acid having five double bonds located at positions 9, 12, 15, 18 and 21 (the (9Z,12Z,15Z,18Z,21Z-isomer).