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4,4,4-Trifluoro-2-butynoic Acid Methyl Ester, is a versatile intermediate in the synthesis of various Fluorinated pharmaceutical compounds. It can be used in the synthesis of Perfluromethylcoumarins, and also for the preparation of regioisomeric (trifluoromethyl)-isoxazolecarboxylate esters and oxime addition products.