2-(4-phenylpiperazin-1-yl)ethyl 3-oxobutanoate

2-[4-(4-methoxyphenyl)piperazin-1-yl]ethyl 3-oxobutanoate

2-[4-(2,3-dichlorophenyl)piperazin-1-yl]ethyl 3-oxobutanoate

2-[4-(2,5-dichlorophenyl)piperazin-1-yl]ethyl 3-oxobutanoate

5,5-dimethyl-3-methylidenehexanoic acid