8-[(Benzyloxy)methyl]-1,4-dioxaspiro[4.5]decan-8-ol

2-(3-{[(Benzyloxy)carbonyl]amino}-1-[(tert-butoxy)carbonyl]-6-methylpiperidin-3-yl)acetic acid

2-{1-[(tert-butoxy)carbonyl]-4-({[(9H-fluoren-9-yl)methoxy]carbonyl}amino)-2-methylpiperidin-4-yl}acetic acid

2-{8-[(Tert-butoxy)carbonyl]-3-{[(tert-butoxy)carbonyl]amino}-8-azabicyclo[3.2.1]octan-3-yl}acetic acid

3,4-Bis({[(tert-butoxy)carbonyl]amino})-3-(ethoxymethyl)butanoic acid

6-[(tert-butoxy)carbonyl]-8-[({[(9H-fluoren-9-yl)methoxy]carbonyl}amino)methyl]-6-azaspiro[3.4]octane-2-carboxylic acid

2-{[(5-Ethylfuran-2-yl)methyl]sulfanyl}-2-methylpropanoic acid

3-{1-[(tert-butoxy)carbonyl]piperidin-4-yl}-3-({[(9H-fluoren-9-yl)methoxy]carbonyl}amino)butanoic acid

4-{[(tert-butoxy)carbonyl]amino}-3-({[(9H-fluoren-9-yl)methoxy]carbonyl}amino)pentanoic acid

2-(3-{[(Benzyloxy)carbonyl]amino}-6-[(tert-butoxy)carbonyl]-6-azabicyclo[3.2.1]octan-3-yl)acetic acid

4-(2-Carbamoylazetidin-1-yl)-4-oxobutanoic acid