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 divalent organic group that is three contiguous constituent monosaccharide units of an oligo- or poly-saccharide, formed formally by loss of the anomeric hydroxy group from the monosaccharide residue at its reducing end and of H from one of the hydroxy groups of the residue at its non-reducing end.