(S)-2-benzyloxycarbonylamino-6-diazo-5-oxohexanoic acid tert-butyl ester

4-[(S)-2-benzyloxycarbonylamino-2-(tert-butyloxycarbonyl)ethyl]-5-[(S)-3-benzyloxycarbonylamino-3-(tert-butyloxycarbonyl)propyl]-3-hydroxypyridine

(S)-6-[Allyl-((S)-5-benzyloxycarbonylamino-5-tert-butoxycarbonyl-2-oxo-pentyl)-amino]-2-benzyloxycarbonylamino-5-oxo-hexanoic acid tert-butyl ester