Piperazine and Impurities

1-[4-(3-acetylbenzenesulfonyl)piperazin-1-yl]-2-chloroethan-1-one

4-(6-Chloro-2-methylsulfanyl-pyrimidin-4-yl)-piperazine-1,3-dicarboxylic acid 1-tert-butyl ester

5-Piperazin-1-yl-nicotinic acid tert-butyl ester

3-Methyl-N-(4-(4-methylpiperazin-1-yl)phenyl)butanamide

1-(Piperidin-3-yl)piperazine

2-[4-(2-Amino-ethyl)-piperazin-1-yl]-ethylamine tetrahydrochloride

methyl (2E)-(3-oxopiperazin-2-ylidene)acetate

4-(4-Methylpiperazin-1-yl)benzene-1,2-diamine tetrahydrochloride

4-(6-Chloropyrimidin-4-yl)-1-methylpiperazin-2-one

2-[(4-Methylpiperazino)methyl]benzaldehyde

2-Piperazin-1-yl-1-piperidin-1-yl-ethanone

4-(Furan-2-carbonyl)-N-phenylpiperazine-1-carboxamide

2-methyl-1-(2-methylpropyl)piperazine

tert-Butyl 2-(2-methylpropyl)piperazine-1-carboxylate hydrochloride

2-Bromo-5-(piperazin-1-yl)-1,3,4-thiadiazole

4-(4-Methyl-pyridin-2-yl)-piperazine-1-carboxylic acid tert-butyl ester

1-[4-(1-methoxypropan-2-yl)piperazin-1-yl]ethan-1-one

tert-butyl 4-{2-[(2-chloropyridin-3-yl)oxy]ethyl}piperazine-1-carboxylate

1-(1-(4-Fluorophenyl)ethyl)piperazine

Tert-butyl 4-(4-amino-3-methylphenyl)piperazine-1-carboxylate