“…However, leaf essential oil contents from S. officinalis collected from Serbia showed mainly α-thujone, viridiflorol, camphor, 1,8-cineole, α-humulene, trans -βcaryophyllene, borneol, and α-pinene [ 13 ]. Generally, the yield and the chemical composition of S. officinalis essential oil depend on various factors (including genetic background, region, environmental conditions, season, plant parts used for essential oil extraction, and the extraction method) as reported by other investigators [ 16 , 29 , 30 , 31 ]. The proportion of oxygenated monoterpenes, such as camphor, 1,8-cineole, α-thujone, and β-thujone, is considered to indicate the quality of the extracted oil.…”