Also, {HEAD ~ a salt} of {TAIL ~ a non chiral auxiliary} can be used as a cyclizing agent in a process using a starting material containing a chiral auxiliary 
of
Also , { HEAD ~ a salt } of { TAIL ~ a non chiral auxiliary } can be used as a cyclizing agent in a process using a starting material containing a chiral auxiliary
OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH