Dynorphin A (1-8) is the predominant opioid peptide identified in placental tissue extracts. Dynorphin A (1-8) is the most likely natural ligand of the kappa receptor. The binding of 3H-Bremazocine to the purified kappa receptor is inhibited by Dynorphin A (1-8) (IC50=303 nM).

4'-Hydroxy-2,4-dimethoxychalcone is a naturally occurring chalcone derivative from the herbal resin of the red geranium Dragon's Blood.4'-Hydroxy-2,4-dimethoxychalcone possesses a wide range of biological activities including anti-malarial, anti-bacterial, anti-fungal, and anti-protozoa activity.

Resinacein L is an inhibitor for α-glucosidase with an IC50 of 0.635 mM. Resinacein L slows down the digestion and absorption of carbohydrates, thereby decreasing postprandial blood glucose.