{HEAD ~ The object} of the present invention is achieved by {TAIL ~ the use} of individual or a mixture of fumaric acid derivative for preparing a pharmaceutical composition for treating mitochondrial diseases, especially for treating Alzheimers disease, Parkinsons syndrome, Chorea Huntington disease, retinopathia pigmentosa and mitochondrial encephalomyopathy 
is achieved by
{ HEAD ~ The object } of the present invention is achieved by { TAIL ~ the use } of individual or a mixture of fumaric acid derivative for preparing a pharmaceutical composition for treating mitochondrial diseases , especially for treating Alzheimers disease , Parkinsons syndrome , Chorea Huntington disease , retinopathia pigmentosa and mitochondrial encephalomyopathy
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