(1R,4R)-[4-(Cyclopropyl-methyl-amino)-cyclohexylamino]-acetic acid

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

4-(2-Hydroxy-ethyl)-piperazine-1-carboxylic acid benzyl ester

4-(2-Amino-ethyl)-2-methyl-piperazine-1-carboxylic acid tert-butyl ester

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

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

1-(4-Acetyl-[1,4]diazepan-1-yl)-2-chloro-ethanone

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

(S)-1-(4-Acetyl-piperazin-1-yl)-2-amino-3-methyl-butan-1-one

4-Carboxymethyl-piperazine-1-carboxylic acid benzyl ester

(4-Acetyl-2-methyl-piperazin-1-yl)-acetic acid