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.
An inorganic heteromonocyclic compound that is 1,3,5-triazine in which the carbon atoms have been replaced by phosphorus atoms. It was one of a series of compounds which was being developed for use as a fire-resistant hydraulic fluid.