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1-[4-(2-Amino-ethyl)-2-methyl-piperazin-1-yl]-ethanone

1-[4-(2-Amino-ethyl)-3-methyl-piperazin-1-yl]-ethanone

1-Acetyl-4-(2-amino-ethyl)-piperazine-2-carboxylic acid methyl ester

2-(3,4-Dimethyl-piperazin-1-yl)-ethylamine

2-(2,4-Dimethyl-piperazin-1-yl)-ethylamine

4-(2-Chloro-acetyl)-2-methyl-piperazine-1-carboxylic acid tert-butyl ester

4-(2-Chloro-acetyl)-3-methyl-piperazine-1-carboxylic acid tert-butyl ester

4-(2-Chloro-acetyl)-piperazine-1,2-dicarboxylic acid 1-tert-butyl ester 2-methyl ester

4-(2-Chloro-acetyl)-2-methyl-piperazine-1-carboxylic acid benzyl ester

4-(2-Chloro-acetyl)-3-methyl-piperazine-1-carboxylic acid benzyl ester