amide comprises a deprotonated chiral auxiliary as defined above in can alternatively be used with a non chiral auxiliary, i.e., an auxiliary as defined above wherein each of R12 and {HEAD ~ R13} are {TAIL ~ hydrogen} 
amide comprises a deprotonated chiral auxiliary as defined above in can alternatively be used with a non chiral auxiliary , i.e. , an auxiliary as defined above wherein each of R12 and { HEAD ~ R13 } are { TAIL ~ hydrogen }
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL