3,5-Dichloro-4-methoxypyridazine

3,5-Dichloro-4-methoxypyridazine corresponds to CAS 2288-74-6 and formula C5H4Cl2N2O. The CAS returns a single PubChem result, CID 13741010, titled 3,5-Dichloro-4-methoxypyridazine. The page title is included among the official synonyms for that CID. Agreement across the name, CAS, and elemental formula establishes the record before the structure notation is considered, which is especially relevant for pyridazine entries with closely spaced substituent numbers.

SMILES COC1=C(N=NC=C1Cl)Cl encodes one methoxy branch and two chlorine substituents on the six-membered diazine ring. Their 3,5 placement and the methoxy group at position 4 are part of the selected graph. PubChem assigns InChIKey FZBKNXQRYVZIKH-UHFFFAOYSA-N, matching the stored InChI and structure. Those fields separate this exact arrangement from dichloromethoxypyridazines whose formula may be identical but whose ring positions differ. The two halogen positions can thus be verified without relying on punctuation in the displayed title.

When this compound is referenced in an enquiry, include CAS 2288-74-6 and retain all three locants in the name. A submitted structure file should show the adjacent 3-chloro, 4-methoxy, and 5-chloro sequence around the ring. CID 13741010, the displayed SMILES, and the InChIKey offer independent cross-check points for that comparison. The record is confined to verified identity information; further questions belong in a request that clearly identifies this particular substitution pattern.