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

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

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

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

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