5-(2,6-Dichlorophenyl)-2-((2,4-difluorophenyl)thio)-6H-pyrimido(1,6-b)pyridazin-6-one

VX-745 is a pyrimidopyridazine, specifically a 6H-pyrimido[1,6-b]pyridazin-6-one substituted at positions 2 and 5 with (2,4-difluorophenyl)sulfanyl and 2,6-dichlorophenyl groups, respectively. It functions as an EC 2.7.11.24 (mitogen-activated protein kinase) inhibitor, an anti-inflammatory drug, and an apoptosis inducer. It is also classified as a difluorobenzene, a dichlorobenzene, and an aryl sulfide.