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