1 Department of Neurology, University Hospital Ulm, 89081, Ulm, Germany.
2 Huntington's Disease Centre, Department of Neurodegenerative Disease, Queen Square Institute of Neurology, University College London, WC1N 3BG, London, UK.
3 Department of Pharmaceutical Organic Chemistry, Faculty of Pharmacy, Assiut University, Assiut, Egypt.
4 Department of Neurology, University Hospital Ulm, 89081, Ulm, Germany. andreas.neueder@uni-ulm.de.