Chemistry is traditionally divided into organic and inorganic chemistry. COA of Formula: C4H2Cl2N2, 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
The present invention provides, in part, compounds of Formula (I): or an N-oxide thereof, or a pharmaceutically acceptable salt of the compound or the N- oxide, wherein: R1, R2, L, A, and E are as described herein; processes for the preparation of; intermediates used in the preparation of; and compositions containing such compounds, N-oxides, or salts, and their uses for treating M4-mediated (or M4- associated) disorders including, e.g., Alzheimer’s Disease, schizophrenia (e.g., its cognitive and negative symptoms), pain, addiction, and a sleep disorder.
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Reference：
Pyridazine – Wikipedia,
Pyridazine | C4H4N1188 – PubChem