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4-chloro-7-fluoroquinazoline; CAS No.: 16499-62-0; ChemShuttle offers 4-chloro-7-fluoroquinazoline for kinase selectivity optimization. The fluorine position creates unique steric effects for isoform discrimination. With molecular weight 202.58 and measured kinase selectivity index >100, it enhances drug candidate profiles. Our production process employs regioselective fluorination to achieve >99% purity.