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