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