methyl (2S,4S)-4-(2-chloro-N-((S)-1-hydroxy-3-phenylpropan-2-yl)acetamido)-1-(2,2-diphenylacetyl)pyrrolidine-2-carboxylate

methyl (2S,4S)-4-((S)-3-benzyl-5-oxomorpholino)-1-(2,2-diphenylacetyl)pyrrolidine-2-carboxylate

(2S,4S)-4-((S)-3-benzyl-5-oxomorpholino)-1-(2,2-diphenylacetyl)pyrrolidine-2-carboxylic acid

methyl (2S,4S)-1-(2,2-diphenylacetyl)-4-(1-oxo-3-phenyl-2,7-diazaspiro[3.5]nonan-7-yl)pyrrolidine-2-carboxylate

2-((3R,5S)-1-(2,2-diphenylacetyl)-5-(methoxycarbonyl)pyrrolidin-3-yl)acetic acid