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1H-indazol-7-ol; CAS No.: 81382-46-9; Specializing in pharma building blocks, we supply hydroxyindazoles for PARP inhibitor synthesis. The 7-hydroxy group and fused ring system mimic nicotinamide pharmacophores. Our directed ortho-metalation achieves regioselective hydroxylation. This intermediate enables development of talazoparib analogs with enhanced DNA repair inhibition potency.