Chemistry is traditionally divided into organic and inorganic chemistry. category: pyridazine, The former is the study of compounds containing at least one carbon-hydrogen bonds.In a patent，Which mentioned a new discovery about 1837-55-4
Diamino-pyridine, pyrimidine and pyridazine compounds which may be used as H4 receptor modulators, and in pharmaceutical compositions and methods for the treatment of disease states, disorders, and conditions mediated by H4 receptor activity, such as allergy, asthma, autoimmune diseases, and pruritis.
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Reference：
Pyridazine – Wikipedia,
Pyridazine | C4H4N1150 – PubChem