Abstract
Four new anti-tumor active prostanoids, named claviridenone-a ( 3), claviridenone-b ( 4). claviridenone-c ( 5), and claviridenone-d ( 6), as well as 20-acetoxy-claviridenone-b ( 7) and 20-acetoxy-claviridenone-c ( 8), have been isolated from the Okinawan soft coral (stolonifer) Clavularia viridis Quoy and Gaimard (Stolonifera, Clavulariidae). The absolute stereostructures of these six prostanoids have been elucidated on the basis of chemical and physicochemical evidence which includes the application of the CD exciton chirality method to their various benzoyl derivatives having benzoate and conjugated diene chromophores. Claviridenones possess a characteristic cross-conjugated dienone-enone chromophore.
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