ethyl 3-[(pentan-3-yl)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

tert-butyl 3-(cyclooctylamino)propanoate

tert-butyl 3-{[2-(dimethylamino)ethyl]amino}-2-methylpropanoate

tert-butyl 2-methyl-3-[(3-methylbutyl)amino]propanoate

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

tert-butyl 3-{[3-(dimethylamino)propyl]amino}-2-methylpropanoate