Norsesquiterpene hydrocarbon, chemical composition and antimicrobial activity of Rhaponticum carthamoides root essential oil

A detailed analysis of Rhaponticum carthamoides (Willd.) Iljin root essential oil was carried out, resulting in identification of 30 constituents. Structure of the main component was elucidated as 13-norcypera-1(5),11(12)-diene and is reported for first time. The oil was active against some Gram-positive bacteria and yeast.