(S)-2-[bis(tert-butoxycarbonyl)amino]-6-hydroxyhexanoic acid tert-butyl ester

(S)-1-tert-butyl-2-[(tert-butoxycarbonyl)amino]-6-sulfonylhexylamide

3,4-bis[(3S)-3-[bis-(tert-butylcarbonyl)amino]-4-(tert-butoxy)-4-oxobutyl]-1-[(5S)-5-[bis(tert-butoxycarbonyl)amino]-6-(tert-butoxy)-6-oxohexyl]-1H-pyrrole-2-carboxylic acid

1-tert-butyl (2S,5R)-6-azido-2-[N-(tert-butoxycarbonyl)-amino]-5-hydroxyhexanoate

(-)-benzyl-1-[(5S)-5-[bis(tert-butylcarbonyl)amino]-6-(tert-butoxy)-6-oxohexyl]-3,4-diethyl-1H-pyrrole-2-carboxylate

(-)-1-[(5S)-5-[bis(tert-butylcarbonyl)amino]-6-(tert-butoxy)-6-oxohexyl]-3,4-diethyl-1H-pyrrole-2-carboxylic acid

1-((S)-5-Amino-5-carboxy-pentyl)-3,4-bis-((S)-3-amino-3-carboxy-propyl)-1H-pyrrole-2-carboxylic acid benzyl ester

(+)-tert-butyl (2S)-2-[(tert-butoxycarbonyl)amino]-4-[(2R)-oxiranyl]butanoate