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1-(4-Carboxyphenyl)-3-n-butyl piperazine

1-(3-Carboxyphenyl)-3-n-butyl piperazine

1-(2-Carboxyphenyl)-3-n-butyl piperazine

1-(4-Carboxyphenyl methyl)-3-n-butyl piperazine

1-(3-Carboxyphenyl methyl)-3-n-butyl piperazine

1-(2-Carboxyphenyl methyl)-3-n-butyl piperazine

1-(3-Carboxyphenyl)-3-ethyl-piperazine

1-(2-Carboxyphenyl)-3-ethyl-piperazine

1-(4-Carboxyphenyl methyl)-3-ethyl-piperazine

1-(3-Carboxyphenyl methyl)-3-ethyl-piperazine

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