Neuropeptide Y (3-36) (porcine) is an agonist of neuropeptide Y (NPY) receptor subtype Y2, and stimulates feeding in rats. Neuropeptide Y (3-36) (porcine) is a highly Y2 selective ligand compared with nselective Y1/Y2 receptor ligand, Neuropeptide Y 1-36.

5-Hydroxymethyl-2-furancarboxylic acid (Sumiki's acid) is a naturally occurring human metabolite. Sumiki's acid was first identified in the urine of a leukemia patient who was excreting an abnormal amount of its glycine derivative. Sumiki's acid has been found to be a byproduct of the fungus Aspergillus and probably other species of fungi and yeast as well.

Kemptide TFA is a synthetic heptapeptide, acting as a substrate for cAMP-dependent protein kinase (PK).