{TAIL ~ The monomers} of the invention are prepared in good yield from {HEAD ~ readily available starting materials} 
{ TAIL ~ The monomers } of the invention are prepared in good yield from { HEAD ~ readily available starting materials }
TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD