(S)-2-Amino-1-[(S)-3-(cyclopropyl-methyl-amino)-piperidin-1-yl]-3-methyl-butan-1-one

((R)-3-Dimethylamino-pyrrolidin-1-yl)-acetic acid

[(S)-3-(Isopropyl-methyl-amino)-pyrrolidin-1-yl]-acetic acid

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

[(R)-3-(Cyclopropyl-methyl-amino)-piperidin-1-yl]-acetic acid

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

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

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

1-Acetyl-4-(2-chloro-acetyl)-piperazine-2-carboxylic acid methyl ester

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

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