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

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

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