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. 2019 Feb 6;14(2):e0211854. doi: 10.1371/journal.pone.0211854

Fig 5. A portion of a 400 MHz spectrum illustrating the identification of peak offsets for the double doublet of aspartate at 2.702 ppm.

Fig 5

Coupling constants J1 and J2 can be used to obtain the location of the four peaks from the center of the multiplet.