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3-bromopyrazolo[1,5-a]pyrimidine-6-carboxylic acid; CAS No.: 1273577-71-1; 3-Bromopyrazolo[1,5-a]pyrimidine-6-carboxylic acid combines bromine handle and carboxylic acid for dual functionalization. The acid group allows conjugation to delivery vectors while bromine enables cross-coupling. ChemShuttle s custom synthesis services develop such bifunctional heterocycles for antibody-drug conjugate payload design.