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 polysaccharide derivative composed of a repeating disaccharide unit, consisting of 2,3-diacetamido-2,3-dideoxy-D-mannuronic acid and 2,3-diacetamido-2,3-dideoxy-L-guluronic acid in an alternating linear sequence, joined by (1->4)-glycosidic linkages.