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.
1,2-diacyl-sn-glycero-3-phosphoethanolamine in which the acyl group at C-1 contains 18 carbons and no double bonds while that at C-2 contains 18 carbons and 2 double bonds.