N-[(R)-1-((S)-2-Amino-3-methyl-butyryl)-piperidin-3-yl]-N-cyclopropyl-acetamide

((S)-3-Acetylamino-pyrrolidin-1-yl)-acetic acid

[3-(Acetylamino-methyl)-pyrrolidin-1-yl]-acetic acid

[3-(Acetylamino-methyl)-piperidin-1-yl]-acetic acid

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

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

(1R,4R)-[4-(Acetyl-ethyl-amino)-cyclohexylamino]-acetic acid

[4-(Acetyl-ethyl-amino)-piperidin-1-yl]-acetic acid

{(S)-2-[(Acetyl-isopropyl-amino)-methyl]-pyrrolidin-1-yl}-acetic acid

[2-(Acetyl-isopropyl-amino)-cyclohexylamino]-acetic acid

{2-[(Acetyl-cyclopropyl-amino)-methyl]-pyrrolidin-1-yl}-acetic acid