Two new alkaloids, 3‐epi‐2, 18‐dimethoxy‐schelhammericine and lenticellarine and a new diterpene, 8β‐methoxysandaracopimarene isolated from the stem of Dysoxylum lenticellare Gillespie were tested against Biomphalaria glabrata Say and found to possess molluscicidal activity. Copyright © 1990 John Wiley & Sons, Ltd.