(S)-5-(3,5-bis(2-((S)-3-(tert-butoxycarbonyl)-2,2-dimethyloxazolidin-4-yl)ethyl)pyridin-4-yl)-2-((tert-butoxycarbonyl)amino)pentanoic acid

(S)-benzyl 5-(3,5-bis((S)-3-((tert-butoxycarbonyl)amino)-4-hydroxybutyl)pyridin-4-yl)-2-((tert-butoxycarbonyl)amino)pentanoate

4,4'-{4-[(S)-4-benzyloxycarbonyl-4-(tert-butoxycarbonyl)aminobutyl]pyridin-3,5-diyl}di[(S)-2-(tert-butoxycarbonyl)aminobutanoic acid]