Poppy acid occurs in opium (Papaver somniferum) and other Papaver species. Meconic acid has been described as a mild narcotic, but it has little or no physiological action, and is not now used medicinally. Its chemical reactions are of importance in toxicology as a valuable indication of the presence of opium.

D-cloprostenol, also called (+)-cloprostenol is a highly potent prostaglandin F2-alpha receptor agonist. (+)-Cloprostenol is a 15(R) enantiomer of cloprostenol responsible for the majority of its biological activity and is commonly used in bovine reproduction that increases myometral contractility.

SR-57227A is a potent and selective agonist at the 5HT3 receptor, with high selectivity over other serotonin receptor subtypes and good blood-brain barrier penetration. SR-57227A had affinities (IC50) varying between 2.8 and 250 nM for 5-HT3 receptor binding sites in rat cortical membranes and on whole NG 108-15 cells or their membranes in vitro. SR 57227A stimulated the uptake of [14C]guanidinium into NG 108-15 cells in the presence of substance P and contracted the isolated guinea-pig ileum, effects that were antagonized by the 5-H 3 receptor antagonist tropisetron. The agonist effect of SR 57227A was also observed in vivo, as the compound elicited the Bezold-Jarisch reflex in anesthetized rats, an effect that was blocked by tropisetron.

alpha-N-methyl-histamine is a metabolite of histamine that plays an important role in several (patho) physiological processes. alpha-N-methyl-histamine is being a potent agonist of histamine H3 receptor can be used as an effective therapeutic alternative in migraine patients.

(Z)-Guggulsterone is a natural product that lowers cholesterol due to its function as an antagonist ligand for the bile acid receptor. (Z)-Guggulsterone is a nuclear hormone receptor that regulates the transcription of several genes involved in cholesterol metabolism and plays a role in cholesterol level regulation. (Z)-Guggulsterone is also a selective farnesoid X receptor (FXR) modulator. Both Guggulsterone isomers were demonstrated to suppress lipopolysaccharide-induced inflammation by inhibiting IκB-α degradation and NF-κB activation. GS has medicinal properties such as anti-inflammatory, hepatoprotective, muscle relaxing, hypocholesterolemic and anti-obesity, antimycobacterial, antischistomal, larvicidal, and molluscicida.

Dimethylphenylpiperazinium (DMPP) is an agonist of nicotinic acetylcholine receptor. DMPP regulates smooth muscle contractility. In addition, it exerts anti-inflammatory properties.

3-Methoxytyramine (3-MT) is a human trace amine that occurs as a metabolite of the neurotransmitter dopamine. It has been shown to act as an agonist of human TAAR1, and an inhibitor of mitochondrial respiration. 3-MT has garnered research interest for its potential links and implications to Parkinson's disease and other Neurological disorders.

SC 26196 is a selective delta6 fatty acid desaturase inhibitor with anti-inflammatory and anti-cancer properties.

Anabasine, a tobacco alkaloid, was used as a biomarker of active tobacco use. Anabasine is a selective alpha7-nicotinic acetylcholine receptor agonist. Anabasine antagonized MK-801-elicited mouse popping behavior, an animal model of schizophrenia.