In the examples, the optical purities of the optically active compounds are determined by comparison of specific rotation with {HEAD ~ compounds} having {TAIL ~ known optical purities} in literatures and by HPLC analysis using an optically active resolution column which is commercially available 
In the examples , the optical purities of the optically active compounds are determined by comparison of specific rotation with { HEAD ~ compounds } having { TAIL ~ known optical purities } in literatures and by HPLC analysis using an optically active resolution column which is commercially available
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 TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH