(2S,4S)-4-(2-benzylpiperidin-1-yl)-1-(2,2-diphenylacetyl)-pyrrolidine-2-carboxylic acid

methyl (2S,4S)-4-((S)-2-benzylpiperidin-1-yl)-1-(2,2-diphenylacetyl)pyrrolidine-2-carboxylate

methyl (2S,4S)-4-((R)-2-benzylpiperidin-1-yl)-1-(2,2-diphenylacetyl)pyrrolidine-2-carboxylate

(2S,4S)-N-(N,N-dimethylsulfamoyl)-1-(2,2-diphenylacetyl)-4-(3-phenylpropoxy)pyrrolidine-2-carboxamide

methyl (2S,4S)-4-(6-benzyl-7-oxo-8-oxa-2,6-diazaspiro[4.5]decan-2-yl)-1-(2,2-diphenylacetyl)pyrrolidine-2-carboxylate