A phloroglucinol derivative from the brown alga Sargassum spinuligerum

Abstract In addition to a large number of fuhalols and phlorethols previously identified in an ethanolic extract of Sargassum spinuligerum , a novel type of phloroglucinol derivative was isolated as its peracetyl derivative and identified by means of spectral analysis. In addition to a phloroglucinol unit, the new compound contains an ascorbic acid moiety. The stereochemistry of this compound was elucidated by NOE experiments in combination with molecular modelling.