Caldariellaquinone {6-(3,7,11,15,19,23-hexamethyltetracosyl)-5-methylthiobenzo[b]thiophen-4,7-quinone (7)} has been isolated from cultures of Caldariella acidophila, an extremely thermophilic and acidophilic bacterium. The structure was determined by degradation, spectroscopic, and 13C biosynthetic studies.
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Rosa et al. (1977) studied this question.