Prorocentin-4, a novel linear polyketide from a marine dinoflagellate Prorocentrum sp.

Prorocentin-4, isolated from a cultured marine dinoflagellate Prorocentrum sp. was possessed of two tetrahydrofuran rings, conjugated dienes, four branched methyl groups, and a ketone moiety. The gross structure was elucidated by spectroscopic studies and the relative stereostructure was determined on the basis of spectral data.

Stereochemistry of tetrahydrofuran rings is relative.