Compounds of {TAIL ~ the formula} ##STR1## the symbols have the meaning described in {HEAD ~ the specification} 
Compounds of { TAIL ~ the formula } # # STR1 # # the symbols have the meaning described in { HEAD ~ the specification }
OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD