Lobeline,(+)- is unnatural enantiomer of Lobeline. Lobeline is the main active alkaloid constituent of Lobelia inflata, a plant sometimes called “Indian tobacco” because it was initially used by Indians of North America as a tobacco substitute. The crude extract is toxic but has been widely recommended for treatment of respiratory illnesses such as asthma, bronchitis, pneumonia, and whooping cough.

Chelerythrine is a kind of benzo[c] phenanthridine alkaloids, which is widely found in plant of Fumariaceae, Papaveraceae, Ranunculaceae and Rutaceae families. Chelerythrine is a potent and specific inhibitor of protein kinase C. In addition chelerythrine inhibits pro-survival protein Bcl(XL) thereby inducing apoptosis. It exerts antitumor properties.

SKF-83822 is a D1/D5 receptor agonist, which activates D1-like receptors coupled to stimulation of adenyl cyclase (AC), but not phosphoinositide (PI) hydrolysis. SKF-83822 is used as a tool compound to study the role of AC-coupled D1 receptors.

Protopine is the isoquinoline alkaloid found primarily in the plant families Berberidaceae, Ranunculaceae, Rutaceae, Fumariaceae. It has diverse biological activities, such as anti-thrombotic, anti-inflammatory, anti-parasitic activity, antimicrobial activity, as well as hepatoprotective effects in animal models. The biological activities of protopine are associated with its ability selectively inhibits K(ATP) channels by targeting on SUR1 subunit. In addition, was discovered that β2 -adrenoceptor (β2 -AR) is a target for antiasthma activities of protopine. On this target, binding of the drug occurs on the amino acid residual of Ser 169 through the formation of hydrogen bonds and receptor‐drug bumps.