Cladosporactone A, a Unique Polyketide with 7-Methylisochromen-3-one Skeleton from the Deep-Sea-Derived Fungus Cladosporium cladosporioides.

A unique polyketide cladosporactone A along with eight known compounds were isolated from the deep-sea-derived Cladosporium cladosporioides. The structure of cladosporactone A was established by spectroscopic analyses, and the absolute configuration was clarified by the theoretical ECD calculation. Cladosporactone A is the first member of polyketide with the 7-methylisochromen-3-one skeleton.