Secretin (28-54), human, which acts on human secretin receptors, is a 27-amino acid residue C-terminally amidated peptide, .

N-ACETYLTRYPTAMINE is a partial agonist for melatonin receptors in the retina. Also used for determination of serotonin N-acetyl transferase.

Isobutyl decanoate (Decanoic acid isobutyl ester) can be used as a biomarker for esophageal squamous cell carcinoma and lung cancer, and can be isolated from wine.