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. 2014 Apr 10;9(4):e94780. doi: 10.1371/journal.pone.0094780

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© 2014 Chang et al

This is an open-access article distributed under the terms of the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are properly credited.

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In the left panel are the P¹,P⁴ regions, and in the right panel are the P²,P³ regions of the spectra. The traces are, from bottom to top: racemic mixture (RM), diastereomer 1.1, 1.2, 1.3, and 1.4.