Three guaiane-type sesquiterpenoids, nardoperoxide (1a), isonardoperox
ide (2a) and nardoxide (3), were isolated from Nardostachys chinensis
roots. Their structures were elucidated by spectral means. Among them,
two endoperoxides, nardoperoxide (1a) and isonardoperoxide (2a), show
ed strong antimalarial activity against Plasmodium falciparum malaria
(EC50 1.5 x 10(-6) and 6.0 x 10(-7) M, respectively). (C) 1998 Elsevie
r Science Ltd. All rights reserved.