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(S)-2-amino-n-cyclopropyl-n-pyrazin-2-ylmethyl-propionamide

(S)-2-amino-3-methyl-n-pyrazin-2-ylmethyl-butyramide

(S)-2-amino-3,n-dimethyl-n-pyrazin-2-ylmethyl-butyramide

(S)-2-amino-n-isopropyl-3-methyl-n-pyrazin-2-ylmethyl-butyramide

(S)-2-amino-n-cyclopropyl-3-methyl-n-pyrazin-2-ylmethyl-butyramide

(S)-2-amino-n-(3-methylsulfanyl-pyrazin-2-ylmethyl)-propionamide

(S)-2-amino-n-methyl-n-(3-methylsulfanyl-pyrazin-2-ylmethyl)-propionamide

(S)-2-amino-n-isopropyl-n-(3-methylsulfanyl-pyrazin-2-ylmethyl)-propionamide

(S)-2-amino-n-cyclopropyl-n-(3-methylsulfanyl-pyrazin-2-ylmethyl)-propionamide

(S)-2-amino-3-methyl-n-(3-methylsulfanyl-pyrazin-2-ylmethyl)-butyramide