Chemistry is traditionally divided into organic and inorganic chemistry. Recommanded Product: 6-Chloro-4-methylpyridazin-3-amine, The former is the study of compounds containing at least one carbon-hydrogen bonds.In a patent，Which mentioned a new discovery about 64068-00-4
COMPOUNDS FOR TREATING SPINAL MUSCULAR ATROPHY
The present invention provides compounds of formula (I) wherein A, R1, R2 and R3 are as described herein, as well as pharmaceutically acceptable salts thereof. Further the present invention is concerned with the manufacture of the compounds of formula (I), pharmaceutical compositions comprising them and their use as medicaments.
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Reference：
Pyridazine – Wikipedia,
Pyridazine | C4H4N1051 – PubChem