Ac-His-Gly-His-NHMe

Ac-His-Gly-His-OH

ethyl (2S)-2-[[(2S)-2-[[2-[[(2S)-2-[[(2S)-2-[[(2S)-2-[[(2S)-2-acetamido-3-(1H-imidazol-5-yl)propanoyl]amino]-3-(1H-indol-3-yl)propanoyl]amino]propanoyl]amino]-3-methylbutanoyl]amino]acetyl]amino]-3-(1H-imidazol-5-yl)propanoyl]amino]-4-methylpentanoate

Acetyl-GRP (20-27) (human, porcine, canine)

Acetyl-glycine methyl amide

Ac-His-His-Gly-His-NHMe

Ac-His-His-Gly-His-OH