I have discovered {HEAD ~ a novel class} of {TAIL ~ compounds} which are useful as growth regulators, particularly for the purpose of yield enhancement or increasing the fruit set of crop plants 
of
I have discovered { HEAD ~ a novel class } of { TAIL ~ compounds } which are useful as growth regulators , particularly for the purpose of yield enhancement or increasing the fruit set of crop plants
OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH