Eight derivatives of teucvidin, a known nor-clerodane diterpenoid isol
ated from Teucrium quadrifarium (Labiatae) were prepared by catalytic
hydrogenation, ester exchange and hydrolysis. Their structures were es
tablished by spectroscopic means. Preliminary bioassay indicated that
teucvidin and its derivatives, especially I and IV showed significant
antifeedant activities against larvae of Leucania separata (Walker).