methyl L-prolyl-D-phenylalaninate

[(S)-1-((S)-3-Benzyl-1,4-dioxo-hexahydro-pyrrolo[1,2-a]pyrazine-2-carbonyl)-2-methyl-propyl]-carbamic acid benzyl ester

methyl L-cysteinyl-L-prolyl-L-phenylalaninate

[(S)-1-((S)-3-Benzyl-1,4-dioxo-hexahydro-pyrrolo[1,2-a]pyrazine-2-carbonyl)-2-methyl-propyl]-carbamic acid tert-butyl ester

N-(9,10-Dihydrolysergyl-O-benzyl-L-seryl)-L-phenylalanyl-L-prolin-lactam

[(S)-2-((S)-3-Benzyl-1,4-dioxo-hexahydro-pyrrolo[1,2-a]pyrazin-2-yl)-1-hydroxymethyl-2-oxo-ethyl]-carbamic acid tert-butyl ester

(L-Valyl)-L-phenylalanyl-L-prolin-lactam

methyl ((R)-2-amino-3-hydroselenopropanoyl)-L-prolyl-L-phenylalaninate

(S,S)-N-(4-dimethoxymethyl-benzoyl)proline-phenylalanine carboxylic acid hydrazide

dimethyl 2,2'-(((2S,2'S)-1,1'-((2R,2'R)-3,3'-diselanediylbis(2-aminopropanoyl))bis(pyrrolidine-1,2-diyl-2-carbonyl))bis(azanediyl))(2S,2'S)-bis(3-phenylpropanoate)

methyl ((R)-2-((tert-butoxycarbonyl)amino)-3-((4-methoxybenzyl)selanyl)propanoyl)-L-prolyl-L-phenylalaninate

dimethyl 2,2'-(((2S,2'S)-1,1'-((2R,2'R)-3,3'-disulfanediylbis(2-aminopropanoyl))bis(pyrrolidine-1,2-diyl-2-carbonyl))bis(azanediyl))(2S,2'S)-bis(3-phenylpropanoate)

dimethyl 2,2'-(((2S,2'S)-1,1'-((2R,2'R)-3,3'-disulfanediylbis(2-((tert-butoxycarbonyl)amino)propanoyl))bis(pyrrolidine-1,2-diyl-2-carbonyl))bis(azanediyl))(2S,2'S)-bis(3-phenylpropanoate)

[(S)-2-((S)-3-Benzyl-1,4-dioxo-hexahydro-pyrrolo[1,2-a]pyrazin-2-yl)-1-benzyloxymethyl-2-oxo-ethyl]-carbamic acid tert-butyl ester

(S,S)-N-(3-dimethoxymethyl-benzoyl)proline-phenylalanine carboxylic acid hydrazide

3-benzylhexahydropyrrolo[1,2-a]pyrazine-1,4-dione

dimethyl 2,2'-(((2S,2'S)-1,1'-((2R,2'R)-3,3'-diselanediylbis(2-((tert-butoxycarbonyl)amino)propanoyl))bis(pyrrolidine-1,2-diyl-2-carbonyl))bis(azanediyl))(2S,2'S)-bis(3-phenylpropanoate)