Protective Groups

4-(1,4-dioxa-8-azaspiro[4.5]dec-8-yl)-4-oxobutanoic acid

4-[(2-tert-butylphenyl)amino]-4-oxobutanoic acid

4-(2,3-dihydro-1H-inden-5-ylamino)-4-oxobutanoic acid

4-{[2-(methylthio)phenyl]amino}-4-oxobutanoic acid

(6-methyl-3-oxo-2,3-dihydro-4H-1,4-benzoxazin-4-yl)acetic acid

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

(3-methyl-2-oxo-3,4-dihydroquinazolin-1(2H)-yl)acetic acid

4-(4-oxoquinazolin-3(4H)-yl)butanoic acid

[2,2-dimethyl-4-(2-methylphenyl)tetrahydro-2H-pyran-4-yl]acetic acid

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

4-(3-pyridin-3-yl-1,2,4-oxadiazol-5-yl)butanoic acid

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

[3-(propionylamino)phenoxy]acetic acid

{1-[(5-methyl-2-furyl)methyl]-3-oxo-2-piperazinyl}acetic acid

(5-ethyl-1-benzofuran-3-yl)acetic acid

[(6-methylthieno[2,3-d]pyrimidin-4-yl)thio]acetic acid