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4-chloro-5H-pyrrolo[3,2-d]pyrimidine; CAS No.: 84905-80-6; 4-Chloro-5H-pyrrolo[3,2-d]pyrimidine, a chlorinated pyrrolopyrimidine, highlights our role as a **chemical synthesis company** supplying **key intermediates** for antiviral nucleoside analogs. The chloro group facilitates substitution with amine or alkoxy groups. Our **CRO chemical synthesis** expertise ensures efficient synthesis of fused heterocycles for high-throughput screening against viral polymerases.