2-Amino-N-cyclopropyl-N-(3-methylsulfanyl-pyrazin-2-ylmethyl)-acetamide

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

(S)-2-Amino-N-cyclopropyl-3-methyl-N-(3-methylsulfanyl-pyrazin-2-ylmethyl)-butyramide

(S)-2-Amino-N-(3-chloro-pyrazin-2-ylmethyl)-N-cyclopropyl-propionamide

(S)-2-Amino-3-methyl-N-(1-pyrazin-2-yl-ethyl)-butyramide

(S)-2-Amino-N-isopropyl-3-methyl-N-(2-oxo-2-pyrazin-2-yl-ethyl)-butyramide

(S)-2-Amino-N-(6-chloro-pyridazin-3-ylmethyl)-N-cyclopropyl-3-methyl-butyramide

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

(1-Pyrazin-2-yl-ethylamino)-acetic acid

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

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