(R)-5-benzyl-7-hydroxy-5-azaspiro[2.4]heptan-4-one

(S)-7-氨基-5-苄基-4-氧代-5-氮杂螺[2.4]庚烷

5-benzyl-5-azaspiro[2.4]heptane-4,7-dione

ethyl 1-(benzylglycyl)cyclopropane-1-carboxylate

1-[2-(Benzyl-tert-butoxycarbonyl-amino)-acetyl]-cyclopropanecarboxylic acid ethyl ester