Protective Groups

[(1-ethyl-1H-indol-3-yl)thio]acetic acid

4,7-dioxo-7-(2-thienyl)heptanoic acid

[(1-benzyl-1H-indol-3-yl)thio]acetic acid

3-[5-(2-thienyl)-2-furyl]propanoic acid

[5-oxo-2-(2-thienyl)cyclopent-1-en-1-yl]acetic acid

3-[5-(4-methylphenyl)-2-furyl]propanoic acid

[(1-methyl-1H-indol-3-yl)thio]acetic acid

{[4-(methylsulfonyl)-2-nitrophenyl]thio}acetic acid

[(2-nitrophenyl)sulfinyl]acetic acid

methyl (3-formyl-2-methyl-1H-indol-1-yl)acetate

[(1-cyclohexyl-1H-benzimidazol-2-yl)thio]acetic acid

3-(2-furyl)-4-phenylbutanoic acid

(2-benzyl-1H-benzimidazol-1-yl)acetic acid

3-[4-(aminocarbonyl)-1-piperidinyl]propanoic acid

3-[(1-ethyl-1H-benzimidazol-2-yl)thio]propanoic acid

3-[(1-phenyl-1H-tetrazol-5-yl)thio]propanoic acid