A new sesquiterpene - tayunin - has been isolated and purified from powdere
d leaves of Inula viscose (L.) Ait. The chemical structure was determined b
y 1D and 2D NMR analysis, and IR and MS. Tayunin inhibits the growth of Mic
rosporum canis at a concentration of 10 mu g/ml and Trichophyton rubrum at
50 mu g/ml (MIC).