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Acyclic and cyclic biphytane carbon skeletons derived from planktonic archaea have been investigated in a number of marine and lacustrine sediments. With the exception of a tricyclic biphytane, the structures have been identified using authentic standards obtained from the thermophilic archaeon Sulfolobus solfataricus. The tricyclic biphytane, which is different to that biosynthesized by S. solfataricus,...
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