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The present invention also discloses the detection of the optical purity of L-3-cyano -2 - hydroxypropyl trimethyl ammonium and the content of its D-isomer in the intermediate mixture, wherein the detection method includes the following steps: ( 1 ) Preparation of the derivatization reagent solution: D-type or L-type optical pure compound of formula (II) is dissolved in solvent above to prepare a 0.01 ∼ 100 mg / ml solution under the dark conditions GLOW vs KLOW Peptide Stacks for Skin Repair & Longevity https://d1k13df5m14swc.cloudfront.net/photos/Dr-Hye-Soo-Kim-DDS-638012-circle_large__v1__.png Shade:65 Topanga ALGOLIA_BEST_SELLER

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