tert-butyl 2-methyl-3-(pentylamino)propanoate

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

methyl 3-{[2-(morpholin-4-yl)ethyl]amino}butanoate

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

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

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

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

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

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

methyl 2-methyl-3-[(4-phenylbutan-2-yl)amino]propanoate

methyl 2-methyl-3-(methylamino)propanoate