Constituents of Nepeta caesarea

The acetone extract of Nepeta caesarea yielded four new nepetalic acid derivatives, 3'alpha-[beta-sitosteryl-3 beta-oxy]dihydronepetalactone (1), 3'beta-[5 alpha-stigmast-7-ene-3 beta-oxy]dihydronepetalactone (2), 3'alpha-[olean-12-ene-28-oyl-3 beta-oxy]dihydronepetalactone (3), and 3'alpha-[lup-20(29)-ene-28-ol-3 beta-oxy]dihydronepetalactone (4). The structures were elucidated by NMR and MS techniques.