Radioiodine-labeled 15- (4-iodophenyl) -3 (R, S) -methylpentadecane which is easy to handle the manufacturing procedure and does not require a large amount of organic solvent in mass production on a commercial production scale A method for producing an acid is provided. A labeling step for obtaining radioiodine-labeled BMIPP by iodine exchange reaction from 15- (4-iodophenyl) -3 (R, S) -methylpentadecanoic acid (BMIPP) and radioiodine, and radioiodine labeling And a purification step of purifying BMIPP by a liquid-liquid extraction method. [Selection figure] None
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