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