(2S,4S)-4-((S)-3-benzylmorpholino)-1-(2,2-diphenylacetyl)pyrrolidine-2-carboxylic acid

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