Bioactive labdane diterpenoids from Renealmia alpinia collected in the Surinam rainforest. - Zhou,B-N.; Baj,N.J.; Glass,T.E.; Malone,S.; Werkhoven,M.C.M.; Troon,F.V.; David,M.; Wisse,J.H.; Kingston,D.G.I. (J Nat Prod, 1997)