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Partial gas chromatogram from cultures grown on naphthalene with benzothiophene as an auxiliary substrate and extracted after 0 (A), 37 (B), 79 (C), and 86 (D) days. I, II, and III, isomers of methyl esters of carboxybenzothiophenes (black peaks); IV, 2-naphthoic acid methyl ester; V, 5,6,7,8-tetrahydro-2-naphthoic acid methyl ester. For more structures, see Fig. 4.
