R4 is halogen, {TAIL ~ alkoxy}, phenylthio or {HEAD ~ phenoxy}, which may be substituted or unsubstituted 
R4 is halogen , { TAIL ~ alkoxy } , phenylthio or { HEAD ~ phenoxy } , which may be substituted or unsubstituted
OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL OTH OTH OTH HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH