In {HEAD ~ addition}, suitable antioxidants include heterocyclic compounds containing sulfur, nitrogen, and {TAIL ~ oxygen} 
In { HEAD ~ addition } , suitable antioxidants include heterocyclic compounds containing sulfur , nitrogen , and { TAIL ~ oxygen }
OTH HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL