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A diterpene with a new skeleton, niphateolide A (1), was isolated from the marine sponge, Niphates olemda, as an inhibitor of the p53-Hdm2 interaction. Its structure was elucidated by NMR spectroscopy and its absolute configuration was established as 10R, 11R by ECD at the vacuum-ultraviolet region with a theoretical calculation. Compound 1 was observed as an inseparable stereoisomeric mixture at...
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