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