(2S)-N-[(2S)-1-[[(2S)-1-amino-4-methyl-1-oxopentan-2-yl]amino]-5-(diaminomethylideneamino)-1-oxopentan-2-yl]-1-[(2S,3R)-2-[[(2S)-2-amino-3-phenylpropanoyl]amino]-3-hydroxybutanoyl]pyrrolidine-2-carboxamide; Phe-Thr-Pro-Arg-Leu-NH2; Leucopyrokinin fragment 4-8