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

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

methyl 3-[(butan-2-yl)amino]-2-methylpropanoate

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

methyl 3-[(3-methylbutyl)amino]butanoate

methyl 3-[(2,2-dimethoxyethyl)amino]butanoate

methyl 3-{[(oxolan-2-yl)methyl]amino}butanoate

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

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

methyl 3-(cycloheptylamino)-2-methylpropanoate

ethyl 3-(2-methylpiperidin-1-yl)propanoate