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CAS No.: 29938-71-4; ChemShuttle supplies building blocks including (5-chloro-1,3-dimethyl-1H-pyrazol-4-yl)(2-fluorophenyl)methanone (CAS 29938-71-4) for PET tracer synthesis. These fluorinated building blocks serve as precursors for nucleophilic displacement with [18F]fluoride. The compound under CAS 29938-71-4 demonstrates our building blocks expertise in electron-deficient carbonyl systems. Researchers leverage such building blocks for developing sigma receptor imaging agents. Our regioselective acylation in building blocks ensures CAS 29938-71-4 maintains precise halogen positioning for radiolabeling applications.