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Kappa agonists, Opioid receptor ligands, Drugs acting on the nervous system, Analgesic, Opioid peptides

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Analgesics (2)
Euphoriants (2)
Mu-opioid agonists (2)
Opioids (2)
Psychoactive drugs (2)
Delta-opioid agonists (1)

adrenorphin (88377-68-8)  
Adrenorphin, also sometimes referred to as metorphamide, is an endogenous, C-terminally amidated, opioid octapeptide (Tyr-Gly-Gly-Phe-Met-Arg-Arg-Val-NH2) that is produced from proteolytic cleavage of proenkephalin A and is widely distributed throughout the mammalian brain. It was named based on the fact that it was originally detected in human phaeochromocytoma tumour derived from the adrenal medulla, and was subsequently found in normal human and bovine adrenal medulla as well. Adrenorphin exhibits potent opioid activity, acting as a balanced μ- and κ-opioid receptor agonist while having no effects on δ-opioid receptors.
Hemorphin 4 (103930-64-9)  
Hemorphin-4 is an endogenous opioid peptide of the hemorphin family which possesses antinociceptive properties and is derived from the β-chain of hemoglobin in the bloodstream. It is a tetrapeptide with the amino acid sequence Tyr-Pro-Trp-Thr. Hemorphin-4 has affinities for the μ-, δ-, and κ-opioid receptors that are in the same range as the structurally related β-casomorphins, although affinity to the κ-opioid receptor is markedly higher in comparison.
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Kappa agonists
Opioid receptor ligands
Drugs acting on the nervous system
Analgesic
Opioid peptides