Biphalin TFA 是能穿透血脑屏障的阿片类肽，具有双活性脑啡肽效应团。该化合物对阿片受体有高亲和力，并在急性、神经性及慢性疼痛动物模型中展现了显著的镇痛活性。此外，Biphalin TFA 还具有抗病毒、抗增殖、抗炎以及神经保护的特性。

β-Lipotropin (61-69) 是一种有效的阿片 (opioid) 激动剂。

Potent, selective partial agonist peptide for the NOP receptor (Ki = 0.71 nM). Selective over μ, δ and κ opioid receptors (IC50 > 4000 nM). Increases food intake in vivo.

Bilaid C is a tetrapeptide μ-opioid receptor agonist (Ki= 210 nM in HEK293 cell membranes expressing the human receptor) that has been found inPenicillium.1It inhibits forskolin-induced cAMP accumulation by 77% in HEK293 cells expressing the human μ-opioid receptor when used at a concentration of 10 μM. Bilaid C induces inward rectifying potassium channel (Kir) currents in rat locus coeruleus slices that endogenously express high levels of the μ-opioid receptor (EC50= 4.2 μM). 1.Dekan, Z., Sianati, S., Yousuf, A., et al.A tetrapeptide class of biased analgesics from an Australian fungus targets the μ-opioid receptorProc. Natl. Acad. Sci. USA116(44)22353-22358(2019)

Dynorphin B (1-13) acts as an agonist on the opioid κ-receptor.

Hemorphin-7 binds to the angiotensin IV receptor, triggering multiple effects including cellular proliferation and memory enhancement. Hemorphins are endogenous peptides belonging to the family of atypical opioid peptides released from hydrolyzed hemoglob