DAA1106 is a potent and selective ligand for peripheral benzodiazepine receptor (PBR), acting as a potent and selective agonist at the peripheral benzodiazepine receptor.

Gluten exorphin C is an opioid peptide derived from wheat gluten. Its IC50 values are 40 μM and 13.5 μM for μ opioid and δ opioid activities in the GPI and MVD assays, respectively.Gluten Exorphin C, isolated from the pepsin-trypsin-chymotrypsin digest of wheat gluten, was considered as a δ-opioid receptor-selective ligand.Gluten exorphin C, a novel opioid peptide, is isolated from the pepsin-trypsin-chymotrypsin digest of wheat gluten.

β-Endorphin, human, a prominent endogenous peptide, existing in the hypophysis cerebri and hypothalamus, is an agonist of opioid receptor, with preferred affinity for μ-opioid receptor and δ-opioid receptor; β-Endorphin, human exhibits antinociception activity.