"(3S,4S)-tert-butyl 3-amino-4-ethoxypyrrolidine-1-carboxylate"
"(3S,4S)-tert-butyl 3-amino-4-ethoxypyrrolidine-1-carboxylate"
"(3S,4S)-tert-butyl 3-amino-4-ethoxypyrrolidine-1-carboxylate"
"(3S,4S)-tert-butyl 3-amino-4-ethoxypyrrolidine-1-carboxylate"