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