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