oxidizing {HEAD ~ the carboxyl acid groups} of {TAIL ~ the resulting graft polymer} into percarboxyl acid groups; and 
of
oxidizing { HEAD ~ the carboxyl acid groups } of { TAIL ~ the resulting graft polymer } into percarboxyl acid groups ; and
OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH