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 partially-defined glycan in which the number and type of monosaccharides (hexose, pentose, etc.) and in which partial or complete stereochemistry of the monosaccharides is known, but the connectivity and configuration of the anomeric linkages are not known. See http://www.ontobee.org/ontology/GNO?iri=http://purl.obolibrary.org/obo/GNO_00000014.