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