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. 2018 May 9;8:7390. doi: 10.1038/s41598-018-25682-4

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© The Author(s) 2018

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(A) Separation of equal amounts of D-phenylalanine and L-phenylalanine; (B) Purity assessment of D-phenylalanine. (C) Zoomed L-phenylalanine peak in D-phenylalanine.