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