Sargassum lacerifolium

Two quaternary arsoniosugars (diastereoisomers), previously isolated as an unresolved mixture (see Fig. 2, structure 14, epimeric at the carbon bonded to the carboxyl group) from the brown alga Sargassum lacerifolium, were separated by HPLC and their structures proposed on the basis of NMR spectral data (17). Electrospray mass spectrometric analysis of the unresolved mixture supports the proposed structures by demonstrating a [M + H]+ molecular species with m/z 569 (Pedersen and Francesconi, unpublished results). The presence of these two compounds in S. lacerifolium formed the basis of a more general scheme for the formation of naturally occurring arsenic compounds (17). 

Sargassum lacerifolium Australia 40 wet minor sig minor major tr (4 cpds) nr tr tr 80... 

JS Edmonds. Diastereoisomers of an arsenomethionine -based structure from Sargassum lacerifolium The formation of the arsenic-carhon bond in arsenic-containing natural products. Bioorg Med Chem Lett 10 1105-1108, 2000. 

Constit. of the seaweeds Hizikia fusiforme, Sargassum lacerifolium and Sphaerotrichia divaricata. 

Sargassum lacerifolium X-ray structure of 2-arrrino-3-(5 -deoxy-5 -(dimefhylarsinoyl)-ribosyl)-propane-l-sulphonic add. J. Chem. Soc. Perkin Trans. I, 2707—2716. 

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