{HEAD ~ Examples} of {TAIL ~ the esters} are triethyl citrate and acetyl tributyl citrate 
of
{ HEAD ~ Examples } of { TAIL ~ the esters } are triethyl citrate and acetyl tributyl citrate
HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH