Problem to be solved: to provide a method of producing a radioactive iodine labelled 15 - (4-iodophenyl) - 3 (R, s) - methyl pentadecanoic acid which is convenient in handling a manufacturing procedure and does not require a large amount of organic solvent in the mass production of commercial production scale.15 - (4-iodophenyl) - 3 (R, s) - methylpentadecanoic acid (BMIPP), and labelling process for obtaining radioactive iodine labeled BMIPP by iodine exchange reaction with radioactive iodine and purification of radioactive iodine labeled BMIPP by liquid liquid extraction method A method of producing radioactive iodine labeled BMIPP represented by the following formula (1) including the manufacturing process and the following process.No selection【課題】商業生産規模の大量合成において、製造手順のハンドリングが簡便であり、かつ多量の有機溶媒を必要としない放射性ヨウ素標識１５－（４－ヨードフェニル）－３（Ｒ，Ｓ）－メチルペンタデカン酸の製造方法を提供する。【解決手段】１５－（４－ヨードフェニル）－３（Ｒ，Ｓ）－メチルペンタデカン酸（ＢＭＩＰＰ）と、放射性ヨウ素とから、ヨウ素交換反応によって放射性ヨウ素標識ＢＭＩＰＰを得る標識工程と、放射性ヨウ素標識ＢＭＩＰＰを、液液抽出法で精製する精製工程と、を含む、下記式（１）で表される放射性ヨウ素標識ＢＭＩＰＰの製造方法。【選択図】なし
