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

tert-butyl 3-[(2-ethoxyethyl)amino]-2-methylpropanoate

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

tert-butyl 2-methyl-3-{[(pyridin-4-yl)methyl]amino}propanoate

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

tert-butyl 3-[(2,2-diethoxyethyl)amino]-2-methylpropanoate

tert-butyl 2-methyl-3-{[3-(propan-2-yloxy)propyl]amino}propanoate

methyl 3-(butylamino)butanoate

methyl 3-(hexylamino)butanoate

methyl 3-(pentylamino)butanoate

methyl 3-{[(4-fluorophenyl)methyl]amino}butanoate