The compound 6, wherein {HEAD ~ the stereochemistry} of the carbon to which R2 and R3 are attached is of {TAIL ~ the S onfiguration} 
is of
The compound 6 , wherein { HEAD ~ the stereochemistry } of the carbon to which R2 and R3 are attached is of { TAIL ~ the S onfiguration }
OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH REL REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL