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N-cyclohexyl-1-phenyl-1H-pyrazolo[3,4-d]pyrimidin-4-amine; CAS No.: 313225-39-7; As a worldwide chemical supplier, we deliver pyrazolopyrimidinamines for PDE5 inhibition studies. The cyclohexylamino group and phenyl substituent enable selective phosphodiesterase binding. Our Negishi coupling achieves efficient pyrazole functionalization. This intermediate supports development of next-generation erectile dysfunction therapeutics with improved pulmonary selectivity over conventional PDE5 inhibitors.