Neo-clerodane diterpenoids from three species of Teucrium - Alcazar, R.; De la Torre, M.C.; Rodriguez, B.; Bruno, M.; Piozzi, F.; Savona, G.; Arnold, N.A. (Elsevier)
Three species of the genus Teucrium have been investigated. Two of them (T. polium subsp. expansum and T. montbretii subsp. heliotropiifolium) contain known neo-clerodane diterpenoids, and the other one (T. cossonii) provides two new neo-clerodane derivatives (teucossins A and B) together with montanin H, a diterpene recently isolated from another Teucrium species. The structures of the new substances [12ξ,19,20-triacetoxy-4α,18;15,16-diepoxy-neo-cleroda-13(16),14-dien-6α-o l (teucossin A) and 12ξ,19-diacetoxy-4α,18;15,16-diepoxy-6-oxo-neo-cleroda-13(16),14-diene-(20 -O-acetyl) 20S,7α-hemiacetal (teucossin B)] were established mainly by spectroscopic means.
http://linkinghub.elsevier.com/retrieve/pii/S0031-9422(00)97562-9
Keywords: W; V