Two new tetranortriterpenoids, severinolide and cycloseverinolide, tog
ether with four known compounds, were isolated and characterized from
the root bark of Severinia buxifolia. Severinolide, atalantin and cycl
oepiatalantin showed significant antifeeding effects against Plutella
xylostalla. (C) 1997 Elsevier Science Ltd. All rights reserved.