(2S)-3-[[2-[(3R,5S)-1-(phenylmethoxycarbonyl)-5-[(pyridin-2-ylamino)methyl]pyrrolidin-3-yl]oxyacetyl]amino]-2-[(2,4,6-trimethylbenzoyl)amino]propanoic acid
(2S)-3-[[2-[(3R,5S)-1-(phenylmethoxycarbonyl)-5-[(2-pyridylamino)methyl]pyrrolidin-3-yl]oxyacetyl]amino]-2-[(2,4,6-trimethylbenzoyl)amino]propanoic acid
(2S)-3-[[1-oxo-2-[[(3R,5S)-1-[oxo-(phenylmethoxy)methyl]-5-[(2-pyridylamino)methyl]-3-pyrrolidinyl]oxy]ethyl]amino]-2-[[oxo-(2,4,6-trimethylphenyl)methyl]amino]propanoic acid
(2S)-3-[[2-[(3R,5S)-1-(benzyloxycarbonyl)-5-[(2-pyridylamino)methyl]pyrrolidin-3-yl]oxyacetyl]amino]-2-[(2,4,6-trimethylbenzoyl)amino]propionic acid
(2S)-3-[2-[(3R,5S)-1-(phenylmethoxycarbonyl)-5-[(pyridin-2-ylamino)methyl]pyrrolidin-3-yl]oxyethanoylamino]-2-[(2,4,6-trimethylphenyl)carbonylamino]propanoic acid