tert-butyl 3-{[2-(diethylamino)ethyl]amino}propanoate

tert-butyl 3-{[3-(dimethylamino)propyl]amino}propanoate

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

tert-butyl 3-(cycloheptylamino)propanoate

Ethyl 3-(propylamino)propanoate

ethyl 3-{[2-(diethylamino)ethyl]amino}propanoate

ethyl 3-[(3-phenylpropyl)amino]propanoate

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

tert-butyl 3-(cyclohexylamino)-2-methylpropanoate

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

tert-butyl 3-{[(4-fluorophenyl)methyl]amino}-2-methylpropanoate