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Abstract
A chemical investigation on the cephalaspidean Bulla occidentalis from the Gulf of Mexico led to known niuhinones A ( 1) and B ( 2) along with a new acyclic polypropionate, named niuhinone C ( 3). A complete NMR assignment of niuhinone A has been achieved by spectroscopic experiments, thus revising the Δ 14 configuration. The occurrence of structurally related polypropionates in Bullidae species from different geographical areas is in agreement with a de novo origin in this family of molluscs and adds a further piece of evidence on prey–predator relationships among cephalaspideans.
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