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