{TAIL ~ The system} may also benefit from the incorporation of a higher than usual proportion of {HEAD ~ 2,4 isomer methylene} diisocyanate  
{ TAIL ~ The system } may also benefit from the incorporation of a higher than usual proportion of { HEAD ~ 2,4 isomer methylene } diisocyanate
TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH