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1-(2-Diethylaminoethyl)piperazine

1-(3-Diethylaminopropyl)piperazine

1-(3-Dimethylaminopropyl)piperazine

4-(4-Carbamoylpiperazine-1-carbonyl)benzoic acid

1-(2-Diisopropylaminoethyl)piperazine

4-(4-Methylpiperazine-1-sulfonyl)phenylamine

1-Amino-4-(2-hydroxyethyl)piperazine

1-(2-Cyanophenyl)piperazine

N,N-Dimethyl-1-piperazineacetamide

1-Boc-4-(2-carboxyphenyl)piperazine