A New Dimension to the Biosynthetic Products Isolated from the SpongeNegombatamagnifica

Abstract
Latrunculeic acid (3), a novel analogue of latrunculin B (2a), was isolated from the Red Sea sponge Negombata magnifica and characterized. Several known compounds were also isolated, including latrunculin B (2a), 15-methoxylatrunculin B (2b), 16-epi-latrunculin B (4), and latrunculin C (5). In contrast to the other members of the latrunculin family, the novel compound 3 is a polyketide devoid of the normal macrocyclic and thiazolidinone rings present in previously identified members of this family.