From the aerial part of a Vietnamese medicinal plant, Orthosiphon stamineus
BENTH. (Lamiaceae), staminol A (1), a diterpene with a novel carbon framew
ork, was isolated together with four new isopimarane-type diterpenes, ortho
siphols F-I (2-5). Their structures were elucidated by the spectroscopic an
alyses. (C) 1999 Elsevier Science Ltd. All rights reserved.