Chemistry involves the study of all things chemical – chemical processes, chemical compositions and chemical manipulation – in order to better understand the way in which materials are structured, how they change and how they react in certain situations. Quality Control of 6-Chloro-3-hydroxypyridazine
The invention provides novel compounds having the general formula wherein R1, R2, R3, X and a are as described in the description and in the claims, as well as or pharmaceutically acceptable salts thereof. The invention also contains compositions including the compounds and methods of using the compounds.
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Reference：
Pyridazine – Wikipedia,
Pyridazine | C4H4N733 – PubChem