5,5-bis(2-Fluorophenyl)-5-hydroxyvaleric Acid is an impurity in the synthesis of 3’-(2-Fluorophenyl) Ezetimibe (F595370). 3’-(2-Fluorophenyl) Ezetimibe is an impurity of Ezetimibe (E975005), an antihyperlipoproteinemic and a cholesterol absorption inhibitor.