Abstract
A cis-isomer of a C 8-diol ester of okadaic acid ( 1) was isolated during large-scale purification of pectenotoxins (PTXs) from extracts of Dinophysis acuta collected from the west coast of South Island, New Zealand. The compound was identified by NMR spectroscopic and liquid chromatography-mass spectrometry (LC-MS) studies, and is the first reported cis-isomer of an okadaic acid C 8-diol-ester identified in Dinophysis. The more abundant trans-C 8-diol ester of okadaic acid ( 2) isolated from the same Dinophysis extract was rapidly hydrolyzed to okadaic acid in vitro by the supernatant from green-lipped mussel hepatopancreas.
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