Abstract: A new triterpene, a-amyrin hexacosoate (I) was isolated together with four known triterpenes, α-amyrenone (II), betulinic acid (III), oleanolic acid (IV) and ursolic acid (V), from the stems and leaves of rosemary (Rosmarinus officinalis L.). The structures were determined by physical and chemical methods.

Key words: Rosemary, Rosemary, Rosmarinus officinalis, Rosmarinus officinalis, Labiatae, Labiatae, Triterpenes, Triterpenes, a-amyrin hexacosoate, a-amyrin hexacosoate