3-{[(tert-butoxy)carbonyl][2-(4-methoxyphenyl)ethyl]amino}propanoic acid

3-{[(tert-butoxy)carbonyl](2-methylcyclohexyl)amino}propanoic acid

tert-butyl 3-{[(furan-2-yl)methyl]amino}propanoate

tert-butyl 3-(butylamino)propanoate

tert-butyl 3-[(3-methylbutyl)amino]propanoate

tert-butyl 3-{[3-(morpholin-4-yl)propyl]amino}propanoate

tert-butyl 3-{[(4-fluorophenyl)methyl]amino}propanoate

tert-butyl 3-{[5-(diethylamino)pentan-2-yl]amino}propanoate

tert-butyl 3-{[(4-chlorophenyl)methyl]amino}propanoate

tert-butyl 3-{[(4-methylphenyl)methyl]amino}propanoate

tert-butyl 3-{[3-(dimethylamino)-2,2-dimethylpropyl]amino}propanoate