6-(2-ethoxyphenyl)-6-oxohexanoic acid

4-oxo-4-(4-pentyloxyphenyl)butyric acid

4-(4-hexyloxyphenyl)-4-oxobutyric acid

8-oxo-8-(4-pentyloxyphenyl)octanoic acid

8-(4-heptyloxyphenyl)-8-oxooctanoic acid

7-(2,5-Dimethoxyphenyl)-7-oxoheptanoic acid

7-(3,4-Dimethoxyphenyl)-7-oxoheptanoic acid

4-(2-Methyl-5-fluorophenyl)-4-oxobutyric acid

6-(3,5-Dimethoxyphenyl)-6-oxohexanoic acid

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

7-[4-(N,N-Diethylamino)phenyl]-7-oxoheptanoic acid