{TAIL ~ A compound} 1 wherein {HEAD ~ Het} is a heterocyclic radical of Formula wherein: 
{ TAIL ~ A compound } 1 wherein { HEAD ~ Het } is a heterocyclic radical of Formula wherein :
TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH OTH