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Pentalenic acid is a sesquiterpenoid that has been found in S. avermitilis.¹ It is a precursor in the biosynthesis of the antibiotic pentalenolactone.

1. Takamatsu, S., Xu, L.-H., Fushinobu, S., et al. Pentalenic acid is a shunt metabolite in the biosynthesis of the pentalenolactone family of metabolites: Hydroxylation of 1-deoxypentalenic acid mediated by CYP105D7 (SAV_7469) of Streptomyces avermitilis J. Antibiot. 64(1),65-71(2011).