1-(3-Chloro-phenyl)-4-oxy-1H-pyrazin-2-one

1-phenyl-2(1H)-pyrazinone 4-oxide

1-(4-Fluoro-phenyl)-4-oxy-1H-pyrazin-2-one

6-chloropyrazino<2,3-d>-1,2,4-triazolo<4,3-b>pyridazine

6-{2-[(2R)-2-methyl-1-pyrrolidinyl]ethyl}quinoxaline