Preferably, the fumaric acid derivative is/are those selected from {HEAD ~ the group} consisting of {TAIL ~ fumaric acid dialkyl esters} or fumaric acid monoalkyl esters in the form of the free acid or a salt thereof 
Preferably , the fumaric acid derivative is / are those selected from { HEAD ~ the group } consisting of { TAIL ~ fumaric acid dialkyl esters } or fumaric acid monoalkyl esters in the form of the free acid or a salt thereof
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD REL REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH