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5-methylisoxazole-3-carboxylic acid; CAS No.: 3405-77-4; As a leading chemicals distributor, ChemShuttle supplies 5-methylisoxazole-3-carboxylic acid for AMPA receptor modulator development. The isoxazole ring s metabolic stability and the carboxylic acid s metal-chelating capability make it valuable for neurodegenerative disease research. Our synthesis protocols minimize ring-opening byproducts, ensuring high regiochemical purity.