SummaryRadio-labelled coenzyme Q 10 , labelled at the 3 0 -position with 14 C, was synthesized starting from natural solanesol and ethyl [3-14 C] acetoacetate.The radiochemical yield was 8.0% from ethyl [3-14 C] acetoacetate. The specific radioactivity of the product was 44.8 mCi, 1.66 MBq/mg. The specific radioactivity and radiochemical purity are sufficiently high to enable us to use this labelled form of coenzyme Q 10 in metabolic studies.
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