{TAIL ~ A diphenylamine} 1, wherein R6 and {HEAD ~ R7} are each hydrogen 
{ TAIL ~ A diphenylamine } 1 , wherein R6 and { HEAD ~ R7 } are each hydrogen
TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD OTH OTH OTH