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 heteropentacyclic compound and polyketide that is 11a,11b-dihydrobenzo[b]cyclopenta[2,3]indeno[4,5-e][1,4]dioxine-6,8,9(8aH)-trione which is substituted by hydroxy groups at positions 1 and 7, and by methyl groups at the 3, 8a, 11 and 11b positions. A cathepsin K inhibitor, it was first isolated from Paecilomyces carneus and subsequently obtained from Aspergillus nidulans cocultivated with a soil-dwelling actinomycete.