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 1-Formylpiperazine 1-[2-(2-Hydroxyethoxy)ethyl]piperazine 1-(4-Hydroxyphenyl)piperazine 1-(3-Hydroxyphenyl)piperazine
 4-(4-Nitrobenzyl)piperazine-1-carboxylic acid tert-butyl ester 4-(2-Formylphenyl)piperazine-1-carboxylic acid tert-butyl ester 4-N-Cbz-2-Hydroxymethyl piperazine 1-Boc-4-(2-carboxyphenyl)piperazine
 (S)-(-)-2-Piperazinecarboxylic acid dihydrochloride N,N-Dimethyl-1-piperazineacetamide 1-(2-Cyanophenyl)piperazine N-Methylhomopiperazine
 4-Methyl-1-(4-aminophenyl)piperazine 1-Amino-4-(2-hydroxyethyl)piperazine 4-(4-Methylpiperazine-1-sulfonyl)phenylamine 1-(2-Diisopropylaminoethyl)piperazine
 4-(4-Carbamoylpiperazine-1-carbonyl)benzoic acid 1-(3-Dimethylaminopropyl)piperazine 1-(3-Diethylaminopropyl)piperazine 1-(2-Diethylaminoethyl)piperazine
 4-N-(2-Aminoethyl)-1-N-Boc-piperazine 1-(2-Aminoethyl)-4-benzylpiperazine 1-(4,6-Dimethyl-2-pyrimidyl)piperazine 1-(2,4-Difluorophenyl)piperazine
 1-[Bis-(4-fluorophenyl)methyl]piperazine 1-(3-Bromophenyl)piperazine 1-(3-Biphenylyl)piperazine 1-(3,5-Bistrifluoromethylphenyl)piperazine
 1-Biphenyl-4-yl-piperazine 1-(2-Ethoxyethyl)piperazine 1-(2-Ethylphenyl)piperazine 1-(4-Ethoxyphenyl)piperazine
 1-[2-Bromo-4-(methylsulfonyl)phenyl]piperazine 1-(Ethylsulphonyl)piperazine 1-(3,4-Dimethylphenyl)piperazine 1-(2-Dimethylaminoethyl)piperazine
 1-[2-(2,5-Dimethyl-1H-pyrrol-1-yl)ethyl]piperazine (1,4-Dimethyl-2-piperazinyl)methanol 1-(3,5-Dimethoxyphenyl)piperazine 1,4-Dihydroxy-2,2-dimethylpiperazine
 1-(3,4-Dimethoxyphenyl)piperazine hydrochloride 1-(3,5-Dichlorophenyl)piperazine 1-Decylpiperazine 1-(3,5-Dichloro-4-pyridyl)piperazine
 1-(3,4-Dichlorophenyl)piperazine 1-(3,4-Dichlorophenyl)piperazine dihydrochloride 1-(Cycloheptyl)piperazine hydrochloride 1-(Cycloheptyl)piperazine
 1-(Dibenzosuberyl)piperazine 1-Cyclopentylpiperazine 1-(Cyclooctyl)piperazine 1-(Cyclohexylmethyl)piperazine
 (4-Hydroxyphenyl)piperazin-1-yl-methanone 1-(3-Hydroxypropyl)-4-methylpiperazine 4-(2-Hydroxypropyl)piperazine-1-carboxylic acidethyl ester 1-(3-Hydroxypropyl)piperazine
 1-(2-Hydroxyphenyl)piperazine 1-(1-Hexyl)piperazine 4-(2-Hydroxyethyl)piperazine-1-carboxylic acidamide 1-(2-Hydroxyethyl)-4-methylpiperazine
 1-(2-Bromobenzyl)piperazine 4-(2-Hydroxyethyl)piperazin-1-carboxylic acidethyl ester 1-(4-Hydroxybutyl)-4-methylpiperazine 1-(4-Bromobenzyl)piperazine
 1-(Biphenyl-2-yl)piperazine dihydrochloride 1-(3-Bromobenzyl)piperazine 1-(2-Methylmercaptophenyl)piperazine 1-(2,5-Dimethylbenzyl)piperazine
 1-(3,4-Dimethylbenzyl)piperazine 1-(2-Fluoro-4-nitrophenyl)piperazine 1-(3,5-Dimethylphenyl)piperazine 1-(2,3-Dimethylphenyl)piperazine
 1-(2,6-Dimethylphenyl)piperazine 1-(2,5-Dimethylphenyl)piperazine 1-[4-Fluoro-2-(methylsulfonyl)phenyl]piperazine 1-(2-Chlorobenzyl)piperazine
 1-(4-Chlorobenzyl)piperazine 1-(3-Chlorobenzyl)piperazine 1-(4-Fluorobenzyl)piperazine 1-(3-Fluorobenzyl)piperazine
 1-(2-Fluorobenzyl)piperazine 1-(4-Fluorobenzyl)-4-(2-hydroxyethyl)piperazine 4,6-Dimethoxy-2-(piperazin-1-ylmethyl)pyrimidine 1-(2-Butyl)piperazine
 1-(4-tert-Butyl phenyl) piperazine 1-(2-Butyl)-4-(2-chloroethyl)piperazine 3-[4-(2-Chloroacetyl)piperazin-1-yl]propionitrile 1-(2-Butyl)piperazine hydrochloride
 tert-Butyl 4-(2-hydroxyethyl)piperazine-1-carboxylate 2-(1-tert-Butoxycarbonylpiperazin-4-yl)propionicacid 3-(1-tert-Butoxycarbonylpiperazin-4-yl)propionicacid tert-Butyl Piperazin-1-yl-acetate dihydrochloride
 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
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