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

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

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

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

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

ethyl 3-[(pentan-3-yl)amino]propanoate

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

ethyl 3-[(1-phenylethyl)amino]propanoate

ethyl 3-[(3-methylbutan-2-yl)amino]propanoate

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

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