Two 3β-carboxy-24-ethylcholestanes (24R and 24S) have been isolated as a mixture from a carbonated sediment and characterised by comparison of their mass spectrometric and 1H NMR spectroscopic data with those of synthetic standards; their origin is still unknown, since their carbon skeleton has not yet been reported in living organisms.
F. Dany, J. Riolo, J. Trendel and P. Albrecht, J. Chem. Soc., Chem. Commun., 1990, 1228 DOI: 10.1039/C39900001228
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