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

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

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

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

tert-butyl 3-{[2-(morpholin-4-yl)ethyl]amino}propanoate

tert-butyl 3-[(2-methoxyethyl)amino]propanoate

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

tert-butyl 3-[(4-phenylbutan-2-yl)amino]propanoate

tert-butyl 3-(octylamino)propanoate

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

ethyl 3-(cyclopropylamino)propanoate