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 tetrahydroxy-monohydroxy-flavone, with the four hydroxy groups at C-3',-4',-5 and 6, and the methoxy group at C-7. It has been isolated from a number of plant species, including Eremosparton songoricum, Rabdosia japonica and Ruellia tuberosa.