Deoxylapachol is a major cytotoxic component of New Zealand brown alga, Landsburgia quercifolia. Deoxylapachol has antifungal and anti-cancer activity[1].
Deoxylapachol is active against P-388 leukemia cells (IC50=0.6 microgm/ml).
[1]. N B Perry, et al. A cytotoxic and antifungal 1,4-naphthoquinone and related compounds from a New Zealand brown algae, Landsburgia quercifolia. J Nat Prod. Jul-Aug 1991;54(4):978-85.