[5-Chloro-3-(3-chloro-phenylamino)-6-methyl-2-oxo-2H-pyrazin-1-yl]-acetic acid

[5-Chloro-3-(4-fluoro-phenylamino)-6-methyl-2-oxo-2H-pyrazin-1-yl]-acetic acid

[5-Chloro-3-(indan-2-ylamino)-6-methyl-2-oxo-2H-pyrazin-1-yl]-acetic acid

{5-Chloro-3-[4-(5-fluoro-benzoimidazol-1-yl)-piperidin-1-yl]-6-methyl-2-oxo-2H-pyrazin-1-yl}-acetic acid

{3-[2-(5-Chloro-6-methyl-2-oxo-3-phenethylamino-2H-pyrazin-1-yl)-acetylamino]-benzyl}-carbamic acid tert-butyl ester