{HEAD ~ The esters} preferably have {TAIL ~ a low boiling point}, particularly below 100° C. at normal pressure 
{ HEAD ~ The esters } preferably have { TAIL ~ a low boiling point } , particularly below 100 ° C. at normal pressure
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