A new tyrosol derivative, the oleic ester of tyrosol, was isolated from fruits of Olea europaea, Cassanese cultivar. Salidroside, the known glucosyl derivative of thyrosol, was isolated from the Carolea cultivar.
The iridoidic composition of Stachys glutinosa L. was examined in comparison with the results obtained in the phytochemical studies on S. corsica Pers. The presence of the known harpagide and acetyl-harpagide were showed together with that of a new di-glycosidic iridoid. The structure of this new compound, the 5-allosyloxy-aucubin, was demonstrated by comparison with the spectroscopical data of monomelittoside and of its 5-O-glucosyl-derivative, the melittoside. The presence of allose in Stachys genus seems to be a chemotaxonomical character.
In this work the iridoidic fraction of Teucrium marum from Sardinia, was examined. A new clerodane, teumarin B, was isolated and identified by 1H- and 13C-NMR spectra analysis. The endemic character of this plant was further confirmed. Teumarin B showed cytotoxic properties.
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