Guaiane sesquiterpenes from Teucrium leucocladum

Three guaiane derivatives have been isolated from the aerial parts of Teucrium leucocladum. Their structures [1α,5β-guai-10(14)-ene-4β,6β-diol (teucladiol), 1α,5β-guaiane-4β,6β,10α-triol (teuclatriol) and 1α,5β-guaiane-4β,6β,10β-triol (10-epiteuclatriol)] were established by 1H and 13C NMR spectroscopic studies and by comparison with closely related compounds. In addition, the already known neo-clerodane diterpene montanin C has also been isolated from the same source. © 1993.