1 GX4 Cyclopropyl-[4-(4-fluorophenyl)piperazin-1-yl]methanone 1.000 2 O1M 4-(4-fluorophenyl)piperazine-1-carboxamide 0.789 3 Q4L Methyl 4-(4-fluorophenyl)piperazine-1-carboxylate 0.750 4 8RS 1-(4-phenylpiperazin-1-yl)ethan-1-one 0.737 5 54U 1-[4-(4-hydroxyphenyl)piperazin-1-yl]ethanone 0.700 6 WNY 1-[4-(4-chlorophenyl)piperazin-1-yl]ethan-1-one 0.700