Chemistry is traditionally divided into organic and inorganic chemistry. name: 3-Chloropyridazine, The former is the study of compounds containing at least one carbon-hydrogen bonds.In a patent，Which mentioned a new discovery about 1120-95-2
Aromatase inhibition is the new standard of care for estrogen receptor positive breast cancer and has also potential for treatment of other diseases such as endometriosis. Simple and readily available 3-pyridyl arylethers and 1-aryl pyrrolo[2,3-c]pyridines recapitulating the key pharmacophore elements of Letrozole (1) are described and their structure-activity relationships are discussed. Potent and ligand efficient leads such as compound 23 (IC 50 = 59 nM on aromatase) have been identified.
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Reference：
Pyridazine – Wikipedia,
Pyridazine | C4H4N437 – PubChem