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

methyl 3-(pentylamino)butanoate

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

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

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

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

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

methyl 3-(methylamino)butanoate

methyl 3-(cyclopentylamino)-2-methylpropanoate

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