Morphiceptin 是一种强效、特异的 morphine (μ) receptors 激动剂。Morphiceptin 是一种合成肽，是牛奶蛋白 β- 酪蛋白片段的酰胺。Morphiceptin 具有吗啡样活性，对吗啡 (μ) 受体具有高度特异性，但对脑啡肽 (?) 受体没有特异性。

(D-Ala2)-β-Casomorphin (1-3) amide

Loperamide oxide (R 58425) is a secreted antidiarrheal agent that increases peristalsis and inhibits intestinal absorption of water and ions and is used in the study of chronic diarrhea in patients with Crohn's disease.