{TAIL ~ Another example} is condensation polymers having covalently bonded as repeating units in the polymer chain, {HEAD ~ aromatic tetracarbonylbisimide groups} of the formula II and III 
{ TAIL ~ Another example } is condensation polymers having covalently bonded as repeating units in the polymer chain , { HEAD ~ aromatic tetracarbonylbisimide groups } of the formula II and III
TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH