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4-Chloro-thieno[3,2-c]pyridine-2-carboxaldehyde is a synthetic building block that is made from 2,4-Dichloropyridine (D435830), which is a versatile reactant used in the preparation of host materials for light-emitting diodes with heterocyclic cores. 2,4-Dichloropyridine is also used in the preparation of sulfonylated pyridines, pyrazine and quinoline via aromatic nucleophilic substitution of azines with sodium sulfinates.