Spectral and chromatographic characterisation of the onoceroid, ambrane: A potential novel biological marker

The gas chromatography–mass spectrometry (GC–MS) characteristics, including GC retention indices and mass spectra, of isomers of the tricyclic onoceroid C30 hydrocarbon, ambrane (1,1,4a,6-tetramethyl-5-{4-methyl-6-[2,2,6-trimethylcyclohexyl]hexyl}decahydronaphthalene) are reported. Ambrane is yet to be reported in sediments or petroleum: other biochemically-related onoceroids, such as onoceranes and serratanes, have been. Now that GC–MS data are available, a search for ambranes in geochemical samples may be both feasible and warranted.