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

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

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

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

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

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

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

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

ethyl 3-(tert-butylamino)propanoate

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

ethyl 3-{[3-(propan-2-yloxy)propyl]amino}propanoate