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 bridged organic heteropentacyclic compund that is 3,4,5,6-tetrahydro-2H,8H-2,6-epoxyoxocino[3,2-b]xanthen-8-one substituted by hydroxy groups at positions 4 and 7, a methoxy group at position 9 and a methyl group at position 2 (the 2S,4R,6S stereoisomer). It is isolated from the marine derived fungus Chaetomium and has antiprotozoal activity.