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 antigen composed of a backbone of repeating alpha-D-Glc-(1->3)-alpha-L-Rha-(1->2)-alpha-L-Rha-(1->3)-2-O-Ac-alpha-L-Rha-(1->3)-beta-D-GlcNAc units that are connected via beta-(1->2)-linkages between the GlcNAc and the Rha residue adjacent to Glc.