1-Piperonylpiperazine32231-06-430 % similar 1-(2,4-Dichlorobenzyl)piperazine51619-56-830 % similar 1-(5-Chloro-2-methylphenyl)piperazine76835-20-630 % similar 1-(4-Methoxyphenyl)piperazine38212-30-530 % similar 1-(4-Fluorophenyl)piperazine dihydrochloride64090-19-330 % similar 1-(4-Bromophenyl)piperazine monohydrochloride68104-62-130 % similar 1-(1-Phenylethyl)piperazine69628-75-730 % similar 1-[2(2-Hydroxyethoxy)ethyl]piperazine dihydrochloride85293-16-930 % similar