1,2-Epoxy-p-menthane Derivatives from Some Labiatae Species

Abstract

ABSTRACT The essential oils of Plectranthus incanus Link and Clinopodium umbrosum (M. Bieb.) Koch, which were produced from plants collected in N.W. Himalayan region of India, were examined by GC/MS. Fourteen constituents were identified in P. incanus oil of which cis-piperitone oxide (35.70%) and piperitenone oxide (45.01%) were most predominant. Although only nine constituents were identified in C. umbrosum oil, cis-piperitone oxide (63.05%) and piperitenone oxide (17.98%) were found as major constituents.