(S)-2-Benzyloxycarbonylamino-5-morpholin-4-yl-5-oxo-pentanoic acid tert-butyl ester

p-[N-methyl-N-(trifluoroacetyl)amino]benzoyl chloride

(S)-2-(4-Methylamino-benzoylamino)-5-morpholin-4-yl-5-oxo-pentanoic acid tert-butyl ester

(S)-2-{4-[Methyl-(2,2,2-trifluoro-acetyl)-amino]-benzoylamino}-5-morpholin-4-yl-5-oxo-pentanoic acid tert-butyl ester

(S)-2-Amino-5-morpholin-4-yl-5-oxo-pentanoic acid tert-butyl ester