N-[(6-amino-2-methylpyridin-3-yl)methyl]-2-[6-methyl-2-oxo-3-(2-phenylethylamino)pyrazin-1-yl]acetamide

2-[6-methyl-2-oxo-3-(2-phenylethylamino)pyrazin-1-yl]acetic acid

[6-Methyl-3-((S)-1-methyl-2-phenyl-ethylamino)-2-oxo-2H-pyrazin-1-yl]-acetic acid

N-(6-Amino-pyridin-3-ylmethyl)-2-(6-methyl-2-oxo-3-phenethylamino-2H-pyrazin-1-yl)-acetamide

[5-Chloro-6-methyl-3-((S)-1-methyl-2-phenyl-ethylamino)-2-oxo-2H-pyrazin-1-yl]-acetic acid