N-[2-(6-oxo-1-phenyl-1,6-dihydropyridazin-4-yl)phenyl]pivalamide
3-phenylpyridazino[4,5-b]indole-4(3H)-one
3-phenyl-5-phenylamino-pyridazino[4,5-c]quinolin-4(3H)-one
5-[2-(1,6-dihydro-6-oxo-1-phenylpyridazin-4-yl)-phenylamino]-3-phenylpyridazino[4,5-c]-quinolin-4(3H)-one
2-phenyl-5-(2-triphenylphosphoranylideneaminophenyl)pyridazin-3(2H)-one