{HEAD ~ The importance} of the production of the separate chiral isomers of the racemic mixtures resides in {TAIL ~ the isolation} of the isomers which frequently have different biological activities 
resides in
{ HEAD ~ The importance } of the production of the separate chiral isomers of the racemic mixtures resides in { TAIL ~ the isolation } of the isomers which frequently have different biological activities
HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH REL REL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH