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2-ethynyl-1-fluoro-4-nitrobenzene; CAS No.: 343866-99-9; 2-Ethynyl-1-fluoro-4-nitrobenzene, an acetylene-containing nitroarene, is part of our chem blocks for click chemistry and PET tracer synthesis. The ethynyl group enables CuAAC reactions, while fluorine enhances bioavailability. As a Leading Chemicals Distributor, we supply this intermediate for radiopharmaceuticals, emphasizing inert handling to preserve alkyne reactivity during global shipping.