α-Oxo-1-piperazineacetic acid691394-09-9100 % similar 1-Acetylpiperazine13889-98-043 % similar N,N-Diethyl-1-piperazinecarboxamide119-54-039 % similar Ethyl 1-piperazinecarboxylate120-43-437 % similar 1-Ethyl-2,3-piperazinedione59702-31-737 % similar N-Boc-piperazine57260-71-636 % similar Isonipecotic acid498-94-234 % similar 2-(1-Piperazinyl)-1-(1-pyrrolidinyl)ethanone39890-45-434 % similar (Piperazin-1-yl)(tetrahydrofuran-2-yl)methanone63074-07-734 % similar Benzoylpiperazine hydrochloride56227-55-533 % similar tert-Butyl 1,4-diazepane-1-carboxylate112275-50-033 % similar 1-(2-Furoyl)piperazine40172-95-033 % similar 4-(1-Piperazinylacetyl)morpholine39890-46-532 % similar 2-Oxa-6-azaspiro[3.3]heptane hemioxalate1045709-32-731 % similar 2-Oxa-6-azaspiro[3,3]heptane oxalic acid salt1159599-99-131 % similar 4-Piperidinecarboxylic acid, hydrochloride (1:1)5984-56-531 % similar Piperazine adipate142-88-131 % similar 1-(2-Furanylcarbonyl)piperazine hydrochloride60548-09-630 % similar