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