Ethyl 1-piperazinecarboxylate120-43-431 % similar 1-(5-Isoquinolinylsulfonyl)piperazine84468-24-630 % similar 1-(Butan-2-yl)piperazine34581-21-030 % similar 1-Hexylpiperazine51619-55-730 % similar 1-Octylpiperazine54256-45-030 % similar 1-Decylpiperazine63207-03-430 % similar 1-Heptylpiperazine82502-77-030 % similar 1-Methylpiperazine dihydrochloride34352-59-530 % similar 1-tert-Butylpiperazine38216-72-730 % similar Isopropylpiperazine4318-42-730 % similar 1-Piperazinecarboxaldehyde7755-92-230 % similar