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4-fluoro-2-methylbenzoic acid; CAS No.: 321-21-1; 4-Fluoro-2-methylbenzoic acid, a fluorinated benzoic acid, underscores our role as a custom chemical synthesis company supplying pharma building blocks for COX-2 inhibitors. The methyl and fluoro groups enhance target binding via hydrophobic interactions. Our services include large-scale carboxylation under phase-transfer conditions.