Protective Groups

[4-(propionylamino)phenoxy]acetic acid

(1-cyclopentyl-3-oxo-2-piperazinyl)acetic acid

{5-[4-(allyloxy)phenyl]-2H-tetrazol-2-yl}acetic acid

[1-(2-methylbenzyl)-3-oxo-2-piperazinyl]acetic acid

3-(3-methoxy-2-quinoxalinyl)propanoic acid

3-(2,3-dihydro-1,4-benzodioxin-6-ylthio)propanoic acid

3-{[4-methyl-5-(4-pyridinyl)-4H-1,2,4-triazol-3-yl]thio}propanoic acid

3-(4-acetyl-3,5-dimethyl-1H-pyrazol-1-yl)butanoic acid

3-{[4-methyl-5-(3-pyridinyl)-4H-1,2,4-triazol-3-yl]thio}propanoic acid

{4-[(cyclopropylcarbonyl)amino]phenyl}acetic acid

N-4-biphenylyl-beta-alanine

3-[3-(2-methoxyphenyl)-1,2,4-oxadiazol-5-yl]propanoic acid

4-[3-(4-methylphenyl)-1,2,4-oxadiazol-5-yl]butanoic acid

4-[3-(3-methoxyphenyl)-1,2,4-oxadiazol-5-yl]butanoic acid

3-{[5-(4-pyridinyl)-1,3,4-oxadiazol-2-yl]thio}propanoic acid

4-[cyclohexyl(methyl)amino]-4-oxobutanoic acid