Compound 6

(S)-N¹-((S)-4-Amino-1-(((S)-1-((S)-2-(((S)-1-((2-amino-2-oxoethyl)amino)-4-methyl-1-oxopentan-2-yl)carbamoyl)pyrrolidin-1-yl)-4-chloro-1-oxobutan-2-yl)amino)-1,4-dioxobutan-2-yl)-2-((2S,3S)-2-((S)-2-((R)-2-amino-3-mercaptopropanamido)-3-(4-hydroxyphenyl)propanamido)-3-methylpentanamido)pentanediamide

From: Selenoether oxytocin analogues have analgesic properties in a mouse model of chronic abdominal pain