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