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