methyl (S)-1-(2,2-diphenylacetyl)-4-oxopyrrolidine-2-carboxylate

methyl (2S,4R)-4-(2-(benzyloxy)ethyl)-1-(2,2-diphenylacetyl)pyrrolidine-2-carboxylate

methyl (S,Z)-4-(2-(benzyloxy)-2-oxoethylidene)-1-(2,2-diphenylacetyl)pyrrolidine-2-carboxylate

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

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