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

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

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

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

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

methyl 3-[(2-ethoxyethyl)amino]butanoate

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

methyl 3-[(3-methoxypropyl)amino]-2-methylpropanoate

methyl 3-{[5-(diethylamino)pentan-2-yl]amino}-2-methylpropanoate

methyl 3-{[3-(1H-imidazol-1-yl)propyl]amino}-2-methylpropanoate