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

{2-[(Cyclopropyl-methyl-amino)-methyl]-piperidin-1-yl}-acetic acid

4-(2-Hydroxy-ethyl)-3-methyl-piperazine-1-carboxylic acid benzyl ester

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

4-(2-Amino-ethyl)-[1,4]diazepane-1-carboxylic acid benzyl ester

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

1-(4-Acetyl-3-methyl-piperazin-1-yl)-2-chloro-ethanone

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

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

1-Acetyl-4-((S)-2-amino-3-methyl-butyryl)-piperazine-2-carboxylic acid methyl ester

4-Carboxymethyl-3-methyl-piperazine-1-carboxylic acid benzyl ester