4-(2-Hydroxy-ethyl)-piperazine-1,2-dicarboxylic acid 1-tert-butyl ester 2-methyl ester

4-(2-Amino-ethyl)-piperazine-1,2-dicarboxylic acid 1-benzyl ester 2-methyl ester

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

1-(4-Acetyl-2-methyl-piperazin-1-yl)-2-chloro-ethanone

2-Chloro-1-(3,4-dimethyl-piperazin-1-yl)-ethanone

4-((S)-2-Amino-3-methyl-butyryl)-piperazine-1,2-dicarboxylic acid 1-benzyl ester 2-methyl ester

4-Carboxymethyl-piperazine-1,2-dicarboxylic acid 1-tert-butyl ester 2-methyl ester

4-Carboxymethyl-[1,4]diazepane-1-carboxylic acid benzyl ester

(2,4-Dimethyl-piperazin-1-yl)-acetic acid

2-{[(2-Hydroxy-ethyl)-methyl-amino]-methyl}-benzonitrile

2-[Methyl-(4-methyl-benzyl)-amino]-ethanol