1 9KB 1-[(4-fluorophenyl)methyl]-4-(3-imidazol-1-ylpropyl)piperazin-2-one 1.000 2 9KE 1-[(4-chlorophenyl)methyl]-4-(3-imidazol-1-ylpropyl)piperazin-2-one 0.917 3 KS0 1-{4-[(4-fluorophenyl)methyl]piperazin-1-yl}propan-1-one 0.708