R8 is H, OH, {HEAD ~ alkoxy}, phenoxy, benzyloxy, ##STR18## NR4 R5, lower alkyl, {TAIL ~ phenyl} or R3 phenyl; R9 is O , CH2 , NH or N  
R8 is H , OH , { HEAD ~ alkoxy } , phenoxy , benzyloxy , # # STR18 # # NR4 R5 , lower alkyl , { TAIL ~ phenyl } or R3 phenyl ; R9 is O , CH2 , NH or N
OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH