Abstract

A new cadinane-type sesquiterpene named cornifronone is isolated from the body surface of a mason bee ( Osmia cornifrons)–derived Streptomyces sp. OC1611-8A. Its structure is identified by high-resolution electrospray ionization mass spectrometry data and nuclear magnetic resonance spectroscopic analysis. The absolute configuration of cornifronone was determined by electronic circular dichroism spectra calculations. Cornifronone inhibits hexokinase activity with a mean IC50 of 124.3 μM.

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