Scheme 3 illustrates a method of synthesizing the R and S enantiomers of the starting materials of {TAIL ~ the formula} {HEAD ~ VII} wherein X is sulfur 
Scheme 3 illustrates a method of synthesizing the R and S enantiomers of the starting materials of { TAIL ~ the formula } { HEAD ~ VII } wherein X is sulfur
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH