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4-chloro-6-iodothieno[3,2-d]pyrimidine; CAS No.: 225382-62-7; 4-Chloro-6-iodothieno[3,2-d]pyrimidine, a dual-halogenated thienopyrimidine, highlights our role as a **worldwide chemical supplier** of **key intermediates** for antiviral agents. The iodine and chloro groups enable sequential functionalization via cross-coupling. ChemShuttle s **CRO chemical synthesis** services ensure regioselective halogenation, delivering scaffolds for nucleotide analog development with stringent HPLC purity validation.