Dieugenol is a neolignan that has been found in N. leucantha and has antioxidative and antiprotozoal activities. It inhibits the formation of thiobarbituric acid reactive substances (TBARS) and scavenges superoxide anions, but not hydroxyl radicals, in cell-free assays. It has anti-trypanosomal activity against T. cruzi amastigotes and trypomastigotes (IC50s=15.1 and 11.5 μM, respectively) but is cytotoxic to NCTC L-929 fibroblasts with a 50% cytotoxic concentration (CC50) value of 58.2 μM.2 Dieugenol (15 μM) disrupts the integrity of the T. cruzi trypomastigote plasma membrane but does not induce the production of reactive oxygen species (ROS) in trypomastigotes or LPS-stimulated and unstimulated isolated mouse peritoneal macrophages.

D-Ala-Lys-AMCA hydrochloride, a known substrate of proton-coupled oligopeptide transporter 1 (PEPT1), emits blue fluorescence and may be transported into Caco-2 cells and liver cancer cells.

Phaclofen (3-Amino-2-(4-chlorophenyl)propanephosphonic acid) is a selective GABAB receptor antagonist, which can partially antagonize the sedative effect of (-)-baclofen, and reversibly antagonize the inhibition of cholinergic convulsive response of guinea pig ileum and distal colon by baclofen or GABA.