Caldariellaquinone, a unique benzo[b]thiophen-4,7-quinone from Caldariella acidophila, an extremely thermophilic and acidophilic bacterium

Abstract

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.