5-(2,6-Dichlorophenyl)-2-((2,4-difluorophenyl)thio)-6H-pyrimido(1,6-b)pyridazin-6-one209410-46-8100 % similar 1-Chloro-2,4-difluorobenzene1435-44-532 % similar 4-Chloro-6-fluoroquinoline391-77-531 % similar