Two new α-pyrone compounds designated marinapyrones A ( 1 ) and B ( 2 ) were isolated along with the known related compound micropyrone B ( 3 ) from the culture broth of rhizosphere-derived actinomycete strain W21-0103. The structures of 1 and 2 were elucidated by spectroscopic data analyses, including 1D and 2D NMR. Compounds 1-3 exhibited weak antioxidant activity in a radical scavenging assay.
Shigeno et al. (Wed,) studied this question.