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Valbenazine (Ingrezza), a potent and highly selective inhibitor of vesicular monoamine transporter type 2 (VMAT2) through the active metabolite hydrotetrabenazine (HTBZ), has been approved for the treatment of tardive dyskinesia and, very recently, for chorea, which is associated with Huntington's disease. Despite numerous synthetic efforts dedicated to the synthesis of HTBZ, the industrial preparation...