Composition of the essential oil of Nepeta rtanjensis Diklic et Milojevic,Lamiaceae from Serbia

The essential oil from the aerial parts of Nepeta rtanjensis DiMic et Miloj evic, Lamiaceae was obtained by steam distillation of the herb, collected i n full blooming stage, with an average yield of 0.3%. Nineteen constituents (95.0% of the total oil) were identified by mass spectrometry. The princip al one was 4a alpha,7 alpha,7a beta-nepetalactone (86.4%), along with 2-met hoxy-p-cresol (1.5%), alpha-pinene (1.4%) and 1,4-dimethylbenzene (1.0%). A ll the others were present in quantities below 1%.