N-[(S)-1-((S)-2-Amino-propionyl)-pyrrolidin-2-ylmethyl]-N-cyclopropyl-acetamide

N-[(S)-1-((S)-2-Amino-3-methyl-butyryl)-pyrrolidin-2-ylmethyl]-N-ethyl-acetamide

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

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

[(S)-2-(Acetylamino-methyl)-pyrrolidin-1-yl]-acetic acid

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

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

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

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

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

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