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