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2-(5-methoxy-2-nitrophenyl)acetic acid; CAS No.: 20876-29-3; This methoxynitrophenyl acetic acid demonstrates our custom synthesis expertise in COX-2 inhibitor development. The 5-methoxy-2-nitro substitution pattern enables selective prostaglandin inhibition. Our Ullmann coupling achieves efficient diaryl formation. The product serves as a key intermediate in celecoxib analog synthesis with enhanced gastrointestinal safety.