(-)-Corynoxidine is an acetylcholinesterase inhibitor with an IC50 value of 89.0 μM, isolated from the aerial parts of Corydalis speciosa.(-)-Corynoxidine exhibits antibacterial activities against Staphylococcus aureus and methicillin-resistant S. aureus strains in different degrees[2].IC50 & Target: IC50: 89.0 μM (acetylcholinesterase)

Corypalmine (IC50=128.0±10.5 uM) can inhibit prolyl oligopeptidase. (-)-Corypalmine shows inhibition activity against spore germination of some fungi.

Cotinine is a chemical derived from the catabolism of nicotine, which is found in cigarette smoke. Since cotinine can be made only from nicotine, and since nicotine enters the body with cigarette smoke, cotinine measurements can show how much cigarette smoke enters the body in a given time. Cotinine itself is not harmful.