A novel neo-clerodane diterpene, teucrasiolide, was isolated from the
aerial parts of Teucrium asiaticum as a mixture of C-15 epimers. Its s
tructure, (15R and 15S, 20R)-15,19-diacetoxy-4 alpha,18-epoxy-6-oxo-20
, 7 l)-hemicetal-neo-cleroda-11E,13Z-dien-16,15-olide, was established
by spectroscopic means. (C) 1977 Elsevier Science Ltd.