1-Benzylpiperazine2759-28-630 % similar 2-(Piperazin-1-yl)-acetic acid H2O37478-58-330 % similar 1-(Oxetan-3-yl)piperazine1254115-23-530 % similar 1-Cyclopropylpiperazine dihydrochloride139256-79-430 % similar 1-Cyclohexylpiperazine17766-28-830 % similar 1-Cycloheptylpiperazine21043-42-530 % similar 1-Cyclooctylpiperazine21043-43-630 % similar 1-Methylhomopiperazine4318-37-030 % similar