4-chloro-2-methyl-5H-pyridazino[3,4-b][1,4]benzoxazin-3-one

8-amino-3,4-dihydro-4,6-dimethyl-2H-pyridazino<4,5-b>-1,4-oxazin-5(6H)-one

7-(4-benzoyloxybutyl)-4-chloro-5-cyano-2-methyl-7H-pyrrolo[2,3-c]pyridazin-3(2H)-one

2-methyl-6-nitro-4-(2-pivaloylaminophenyl)pyridazin-3(2H)-one

4-ethoxy-2-methyl-5-(3-morpholinopropyl)-2H-pyridazino<3,4-b><1,4>benzoxazin-3(5H)-one