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

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

tert-butyl 3-(cyclopentylamino)propanoate

ethyl 3-[(2-ethoxyethyl)amino]propanoate

ethyl 3-[(2-phenylethyl)amino]propanoate

ethyl 3-{[2-(piperidin-1-yl)ethyl]amino}propanoate

ethyl 3-[(2,2-dimethoxyethyl)amino]propanoate

ethyl 3-[(prop-2-en-1-yl)amino]propanoate

ethyl 3-[(diphenylmethyl)amino]propanoate

ethyl 3-{[2-(1H-indol-3-yl)ethyl]amino}propanoate

ethyl 3-[(2,2-diethoxyethyl)amino]propanoate