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 withanolide that is (22R)-22,26-epoxyergosta-1,4,24-triene substituted by oxo groups at positions 3 and 26 and an acetoxy group at position 18. Isolated from Paraminabea acronocephala, it exhibits anti-inflammatory activity.