The invention provides concatenated cyclobutane lipids and their production by culturing anammox bacteria, such as Brocadia anammoxidans. The lipids can be isolated by extraction and comprise a tetracyclo[8.2.0.02,9.03,8]dodecane or pentacyclo[8.2.0.02,9.03,8.04,7]dodecane structure to which a functionalised alkyl chain is attached.
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