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3-bromo-6-(methylsulfanyl)-1H-pyrazolo[3,4-d]pyrimidine; CAS No.: 1306829-95-7; This 3-bromo-6-(methylsulfanyl)pyrazolopyrimidine serves as key intermediates for JAK inhibitor development. The bromine allows cross-coupling, while the thioether enables oxidation to sulfone for potency tuning. As a leading chemicals distributor, we ensure strict control of sulfur content (<0.1% DMSO) for cell-based assay compatibility.