multiple sclerosis, hypertension, Alzheimer disease, and as inhibitors of the production and transduction of cytokines. 3(2H)-Pyridazinone derivatives, have been also recently referred" as drugs for inhibiting vascular intimal hyperplasia. Norflurazon, belongs to this core heterocycle with herbicidal activity inhibiting the biosynthesis of long-chain carotenoids, effecting on protein composition and chlorophyll