4-[4-(N,N-Diethylamino)phenyl]-4-oxobutyric acid

5-(2-(Methylthio)phenyl)-5-oxovaleric acid

4-(2,3,5,6-Tetramethylphenyl)-4-oxobutyric acid

4-(2,3,4,5,6-Pentamethylphenyl)-4-oxobutyric acid

5-(5-Fluoro-2-methoxyphenyl)-5-oxovaleric acid

4-(3-Chloro-4-methylphenyl)-4-oxobutyric acid

5-[3-(N,N-Dimethylamino)phenyl]-3-methyl-5-oxovaleric acid

2,2-Dimethyl-4-[2-(ethylthio)phenyl]-4-oxobutyric acid

5-(4-Isopropylphenyl)-3-methyl-5-oxovaleric acid

2,2-Dimethyl-4-oxo-4-(2,4,5-trimethylphenyl)butyric acid

2,2-Dimethyl-4-oxo-4-(2,3,4,5,6-pentamethylphenyl)butyric acid