Abstract
The chemical composition of the marine sponge Phorbas tenacior was investigated in depth. The anchinopeptolides A–D bearing a central pyrrolidinone were isolated together with a new congener named anchinopeptolide E corresponding to an epimer of anchinopeptolide C. The relative configuration of the central core of anchinopeptolide E was determined by extensive NMR analyses. Additionally, the previously isolated cyclobutane derivative cycloanchinopeptolide C was not detected from the sponge extract but could be synthesised by a photoinduced intramolecular [2+2] cycloaddition giving convincing evidence for its artefactual origin.
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