L-Tyr-L-Pro-L-Phe-L-Pro-NH2

L-Prolinamide, L-tyrosyl-L-prolyl-L-phenylalanyl-

(2S)-1-[(2S)-2-amino-3-(4-hydroxyphenyl)propanoyl]-N-[(2S)-1-[(2S)-2-carbamoylpyrrolidin-1-yl]-1-oxo-3-phenyl-propan-2-yl]pyrrolidine-2-carboxamide