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4-oxo-4H-chromene-2-carboxylic acid; CAS No.: 4940-39-0; 4-oxo-4H-chromene-2-carboxylic acid (CAS 4940-39-0) exemplifies ChemShuttle s focus on chemical building blocks for chromene derivatives. This chromene-carboxylic acid (CAS 4940-39-0) acts as a chemical building block in natural product analog synthesis. As a CRO chemical synthesis partner, ChemShuttle optimizes CAS 4940-39-0 s solubility for formulation studies.