Sesqui- and diterpenes from the liverwort Gackstroemia decipiens

Six rosanes, 5 beta,11 beta-dihydroxy-ros-15-ene, 5 beta, 12 beta-dihydroxy -ros-15-ene, 11 beta-hydroxy-7-oxo-rosa-5,15-diene, 1 alpha,5 beta,11 beta- trihydroxy-7-oxo-ros-15-ene, 5 beta,20-epoxy-20-hydroxy-ros-15-ene and 5 be ta,20-epoxy-20-methoxy-ros-15-ene along with the enantiomer of the already reported 11 beta-hydroxy-rosa-5,15-diene and the known 5 beta-hydroxy-ros-1 5-ene have been isolated from the liverwort Gackstroemia decipiens. Further more, the sesquiterpenes 3-acetoxy-7,11-dihydroxy-farnesa-1,5,9-triene and 1 beta,10 beta-epoxy-nardosin-7,11-diene were identified. Their structures were elucidated by NMR spectroscopy. (C) 2000 Elsevier Science Ltd. All rig hts reserved.