Chemistry is traditionally divided into organic and inorganic chemistry. Quality Control of 3-Chloro-6-methylpyridazine, The former is the study of compounds containing at least one carbon-hydrogen bonds.In a patent，Which mentioned a new discovery about 1121-79-5
The present invention relates to compounds defined by formula I wherein the variables R1, R2, R3, R4, and m are defined as in claim 1, possessing valuable pharmacological activity. Particularly, the compounds are inhibitors of 11beta-hydroxysteroid dehydrogenase (HSD) 1 and thus are suitable for treatment and prevention of diseases which can be influenced by inhibition of this enzyme, such as metabolic diseases, in particular diabetes type 2, obesity, and dyslipidemia
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Reference：
Pyridazine – Wikipedia,
Pyridazine | C4H4N570 – PubChem