(1R,4R)-(S)-N-[4-(Acetyl-isopropyl-amino)-cyclohexyl]-2-amino-propionamide

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

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

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

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

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

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

N-[1-((S)-2-Amino-3,3-dimethyl-butyryl)-pyrrolidin-2-ylmethyl]-N-isopropyl-acetamide

N-[(S)-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

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

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

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

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

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