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