ACHE and Alzheimer disease: Among these, 2-hydroxy-9-methoxyaporphine, laurotetanine, and liriodenine from Beilschmiedia alloiophylla (Rusby) Kosterm and B. kunstleri Gamble exhibited AChE inhibitory activities that were comparable to that of huperzine A, a prescribed drug to treat AD [13], while angustidine, nauclefine, angustine, and harmane from Nauclea officinalis (Pierre ex Pit,) Merr.