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 5-Bromo-2-(piperazin-1-yl)pyrimidine 1-(2-Bromophenyl)piperazine 2-(4-Benzylpiperazino)benzaldehyde 2-(4-Ethylpiperazin-1-yl)benzaldehyde
 1-Methyl-4-(4-nitrobenzyl)piperazine 4-[(4-Methylpiperazin-1-yl)methyl]benzaldehyde 1-Ethyl-4-(4-nitrobenzyl)piperazine 4-(4-Benzyl-1-piperazino)-3-bromobenzaldehyde
 1-Methyl-4-(3-nitrobenzyl)piperazine Tert-Butyl 4-(3-nitrobenzyl)piperazine-1-carboxylate 1-Benzyl-4-(4-nitrobenzyl)piperazine 4-(4-Ethylpiperazin-1-yl)benzaldehyde
 1-(2-Thiophen-2-yl-ethyl)piperazine 1-Methyl-4-(piperidin-4-yl)piperazine 1-(2-Methylnaphthalen-1-ylmethyl)piperazine 1-(3-Methylphenyl)piperazine
 1-(2-Methylphenyl)piperazine 1-Thiazole-2-yl-piperazine 1-(4-Methylphenyl)piperazine 1-(Toluene-4-sulfonyl)piperazine
 1-(N-Methylpiperidin-4-yl)piperazine 1-(N-Methylpiperidin-4-yl-methyl)piperazine N-(4-Methoxyphenyl)piperazine N-Acetyl-4-(4-hydroxyphenyl)piperazine
 1-(o-Tolyl)piperazine hydrochloride 1,4-Diformylpiperazine 2-Piperazin-1-Yl-quinoline 3,6-Dimethyl piperazine-2,5-dione
 1-[4-(4-Methylpiperazino)phenyl]-1-ethanone 5-(4-Methylpiperazin-1-yl)-2-nitrophenylamine 1-Isopropyl-4-(4-hydroxyphenyl)piperazine 4-Chloro-1-(piperazin-1-yl)isoquinoline
 1-Methyl-4-(3-nitrophenyl)piperazine 1-Allylpiperazine 4-Benzoylpiperazine-1-carboxamide 1-Cyclopropylpiperazine dihydrochloride
 1-Methyl-4-phenylpiperazine 1-Ethylpiperazine 2-Methylpiperazine 1-Phenyl-3-(piperazin-1-yl)propan-1-one
 (R)-1-Boc-2-(hydroxymethyl)piperazine (S)-1-Boc-2-(hydroxymethyl)piperazine 1-(4-Chlorophenyl)piperazine 1-(2-Chlorophenyl)piperazine
 N-Benzyl-2-piperazin-1-yl-acetamidedihydrochloride 1-[4-Chloro-3-(trifluoromethyl)phenyl]piperazine 4-Benzyloxycarbonylpiperazin-2-one 1-(5-Chloro-2-methoxyphenyl)piperazine hydrochloride
 1-(3-Aminopropyl)piperazine N-Isopropyl-1-piperazineacetamide N-Propylpiperazine 1-[2-(Trifluoromethyl)quinol-4-yl]piperazine
 (R)-3-Isopropyl-2,5-piperazinedione 1-(Diphenylmethyl)piperazine 4-N-Boc-2-oxo-piperazine 1-(3-Methoxyphenyl)piperazine dihydrochloride
 1-Phenylpiperazine hydrochloride (S)-2-Piperazine-tert-butylcarboxamide tert-Butyl-4-benzyl-1-piperazine carboxylate 1-(4-Methoxyphenyl)piperazine dihydrochloride
 1-(2-Pyridyl)piperazine 1-(2-Methoxyphenyl)piperazine N-Isobutylpiperazine 1-N-Heptylpiperazine
 1-(1-Pyrrolidinylcarbonylmethyl)piperazine hydrochloride 1-(N-Butyl)piperazine 1-(4-tert-Butylbenzyl)piperazine (4-Nitrophenyl)piperazin-1-yl-methanone
 1-(3-Nitrophenyl)piperazine hydrochloride 1-(4-Nitrophenyl)piperazine 1-(2-Nitrophenyl)piperazine 1-(4-Methoxyphenyl)-4-(4-nitrophenyl)piperazine
 1-Phenylpiperazine 4-Benzoylpiperazine-1-carboxamidine 1-Benzoylpiperazine 1-(4-Benzhydrylpiperazin-1-yl)-2-chloroethanone
 1-N-Octylpiperazine 1-(3-Nitrobenzyl)piperazine dihydrochloride 1-(2-Nitrobenzyl)piperazine dihydrochloride 1-(1-Naphthylmethyl)piperazine
 1-(1-Naphthyl)piperazine hydrochloride 1-Naphthalen-2-yl-piperazine dihydrochloride 1-(4-Bromophenyl)piperazine hydrochloride 1-Methyl-3-phenylpiperazine
 1-(4-Acetylphenyl)piperazine 1-(4-Benzyloxyphenyl)piperazine hydrochloride N-(2, 6-Dimethylphenyl)-1-piperazineacetamide 1-(4-Chlorobenzhydryl)piperazine
 1-(2-Tetrahydrofuroyl)piperazine hydrobromide 1-(2-Furoyl)piperazine hydrochloride 1-(2,3-Dichlorophenyl)piperazine hydrobromide 3-(1-Piperazinyl)-1,2-benzisothiazole
 1-(2-Methoxylphenyl)piperazine hydrobromide 1-Cinnamoylpiperazine 1-Ethyl-2,3-dioxopiperazine 1-(Cinnamyl)piperazine
 1-Chloropropyl-4-methylpiperazine 1-Amino-4-cyclopentylpiperazine 1-(4-Hydroxybenzoyl)-4-methylpiperazine 1-(4-Chlorophenyl)piperazine dihydrochloride
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