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

N-[1-((S)-2-Amino-3-methyl-butyryl)-piperidin-4-yl]-N-isopropyl-acetamide

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

N-[1-((S)-2-Amino-3-methyl-butyryl)-piperidin-4-ylmethyl]-N-cyclopropyl-acetamide

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

((R)-3-Acetylamino-piperidin-1-yl)-acetic acid

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

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

[(S)-3-(Acetyl-ethyl-amino)-pyrrolidin-1-yl]-acetic acid

[(R)-3-(Acetyl-ethyl-amino)-pyrrolidin-1-yl]-acetic acid

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