{HEAD ~ These complexes} are insoluble in methylene chloride and can be separated from unreacted polyetherimide by {TAIL ~ filtration} 
{ HEAD ~ These complexes } are insoluble in methylene chloride and can be separated from unreacted polyetherimide by { TAIL ~ filtration }
HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL