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