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2H-1-benzopyran-3-carboxylic acid; CAS No.: 22649-28-1; 2H-1-benzopyran-3-carboxylic acid represents our chroman derivatives for natural product synthesis. Operating through our chemical online mall, ChemShuttle offers flavonoid precursors and COX inhibitor intermediates. We specialize in regioselective functionalization of fused ring systems, providing technical data packages that include X-ray crystallography results for key compounds.