Piperazin-2-one

1-CYCLOPENTYL-PIPERAZIN-2-ONE

4-(2-CHLORO-ACETYL)-PIPERAZIN-2-ONE

4-{4-amino-6-[(2-phenylethyl)amino]-1,3,5-triazin-2-yl}piperazin-2-one

4-(4-amino-2-chlorophenyl)piperazin-2-one