Biomimetic synthesis and structural reassignment of the tridachiahydropyrones

The biomimetic synthesis and structural reassignment of tridachiahydropyrone, tridachiahydropyrone B and tridachiahydropyrone C, isolated from mollusks of the order Sacoglossa, using a sequenceof photochemical transformations from a common polyene precursor are described. These complex naturalproducts may act as sunscreens for the producing organism, thus offering protection from harmful UV radiation and oxidative damage