and of {TAIL ~ the general formula} ##STR16## in which {HEAD ~ R2} is halogen, cyano, alkyl, alkoxy or alkoxycarbonyl and 
and of { TAIL ~ the general formula } # # STR16 # # in which { HEAD ~ R2 } is halogen , cyano , alkyl , alkoxy or alkoxycarbonyl and
OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH REL OTH HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH