Two new macrocyclic cembranoids were isolated from the South China Sea soft coral Lobophytum sp. Quantum mechanical-nuclear magnetic resonance (QM-NMR) methods were decisive in their structural elucidation. Better performance in… Click to show full abstract
Two new macrocyclic cembranoids were isolated from the South China Sea soft coral Lobophytum sp. Quantum mechanical-nuclear magnetic resonance (QM-NMR) methods were decisive in their structural elucidation. Better performance in arriving at definitive structures was obtained by QM-NMR methods upon incorporation of 3JHH values. The validity of this approach also supported an alternative conformational proposal versus that obtained by X-ray crystallography.
               
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