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

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

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

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

(S)-N-[4-(Acetyl-methyl-amino)-cyclohexyl]-2-amino-3-methyl-butyramide

(S)-N-[2-(Acetyl-ethyl-amino)-cyclohexyl]-2-amino-3-methyl-butyramide

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

(S)-N-[2-(Acetyl-cyclopropyl-amino)-cyclohexyl]-2-amino-3-methyl-butyramide

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

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

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