(2S,3S,4R,5S)-tert-butyl-3,4-bis(benzyloxy)-2-(benzyloxymethyl)-5-vinylpyrrolidine-1-carboxylate

(2S,3S,4R,5S)-1-benzyl-3,4-bis(benzyloxy)-2-(benzyloxymethyl)-5-(trityloxymethyl)pyrrolidine