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