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4-chloro-2-iodo-1-methyl-1H-pyrrolo[2,3-b]pyridine; CAS No.: 1312581-09-1; Our 4-chloro-2-iodo-1-methyl-1H-pyrrolo[2,3-b]pyridine combines halogen diversity for sequential cross-coupling reactions. The methyl group at N1 prevents unwanted tautomerization, stabilizing the pyrrolopyridine core. ChemShuttle s custom chemical synthesis companies focus on iodo-heterocycles for PET tracer development, offering radiolabeling-ready precursors with defined substitution patterns.