(S)-N-(diphenylmethyloxycarbonyl)methyl-2-azetidinone

1-benzyl 5-methyl (R)-3-tert-butoxycarbonylaminoglutarate

(R)-3-Benzylamino-4-chlorocarbonyl-butyric acid methyl ester; hydrochloride

(S)-4-carboxymethyl-2-azetidinone