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.
An organic heterotetracyclic compound that is 3,4-dihydro-2H,12H-pyrano[2,3-a]xanthen-12-one substituted by hydroxy groups at positions 5 and 9, a methoxy group at position 10, two methyl groups at position 2, a prenyl group at position 11 and an oxo group at position 12.