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