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

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

tert-butyl 3-[(2,2-diethoxyethyl)amino]propanoate

tert-butyl 3-(cycloheptylamino)propanoate

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

ethyl 3-{[(pyridin-2-yl)methyl]amino}propanoate

ethyl 3-{[(2H-1,3-benzodioxol-5-yl)methyl]amino}propanoate

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

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

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

tert-butyl 3-(tert-butylamino)propanoate