A new abietane diterpenoid, leonubiastrin, has been isolated from Leon
urus marrubiastrum and its structure (methyl 6 beta-acetoxy-7 1-dihydr
oxy-3-oxoabieta-1,8,11,13-tetraen-19-oate) established by spec troscop
ic means. (C) 1998 Elsevier Science Ltd. All rights reserved.