{HEAD ~ A method} of treating a patient suffering from a mitochondrial disease, said method comprising administering to said patient {TAIL ~ a pharmaceutical composition} comprising an individual fumaric acid derivative or a mixture of fumaric acid derivatives, wherein said or is selected from the group consisting of 
{ HEAD ~ A method } of treating a patient suffering from a mitochondrial disease , said method comprising administering to said patient { TAIL ~ a pharmaceutical composition } comprising an individual fumaric acid derivative or a mixture of fumaric acid derivatives , wherein said or is selected from the group consisting of
HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH