Trans–cis nepetalactone was isolated from catnip oil by silica flash chromatography as described by Sherden et al.5 Cis—trans nepetalactone synthesis from the same product via base-catalyzed isomerization has been described by Geu-Flores et al. (11). Reduction to the corresponding trans—cis nepetalactol and cis—trans iridodial has been described previously (11).5