Meroditerpenes from the Brown Alga Cystoseira crinita off the French Mediterranean Coast

Abstract Three new meroditerpenes related to zosterdiol A have been isolated from the brown alga Cystoseira crinita . Their structures have been established mainly by means of 2D NMR experiments: COSY, HCCORR and HMBC correlations. They have also been quantitatively analysed and their geographical variation has been studied from a chemotaxonomic point of view.