Abstract
Chemical degradation shows that an apparently homogeneous preparation from the lipids of Methanobacterium thermoautotrophicum is in fact a mixture of the regioisomeric compounds 2 and 8 differing in the relative orientation of their glycerol units; a similar situation holds for the related diglycerol tetraethers of Thermoplasma acidophilum and Sulfolobus solfataricus.

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