(S)-2-Amino-N-(3-chloro-pyrazin-2-ylmethyl)-N-isopropyl-3-methyl-butyramide

(S)-2-Amino-N-isopropyl-N-(1-pyrazin-2-yl-ethyl)-propionamide

(S)-2-Amino-N-cyclopropyl-N-(2-oxo-2-pyrazin-2-yl-ethyl)-propionamide

(S)-2-Amino-N-(6-chloro-pyridazin-3-ylmethyl)-3,N-dimethyl-butyramide

(S)-2-Amino-N-(6-chloro-pyridazin-3-ylmethyl)-propionamide

[(Pyrazin-2-ylmethyl)-amino]-acetic acid

[(3-Methylsulfanyl-pyrazin-2-ylmethyl)-amino]-acetic acid

[(3-Methoxy-pyrazin-2-ylmethyl)-amino]-acetic acid

(2-Oxo-2-pyrazin-2-yl-ethylamino)-acetic acid

[Isopropyl-(2-oxo-2-pyrazin-2-yl-ethyl)-amino]-acetic acid

[Cyclopropyl-(6-methoxy-pyridazin-3-ylmethyl)-amino]-acetic acid