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Shown below is the $^1$HNMR (1R, 2S)-ephedrine spectrum in ${D}_{2}O$. Maleic acid was added as an internal standard. The structure of maleic acid is shown on the bottom left, while that of (1R, 2S)-ephedrine is shown on the bottom right (hydrogens in it are labeled with lower case letters).

Determine the identity of the doublet at 5.14 ppm by matching it with the hydrogens labeled with lower case letters.

$^1H$NMR of (1R, 2S)-Ephedrine. Created for Albert.io. Copyright 2016. All rights reserved.

A

a

B

b

C

c

D

d

E

e

F

f

G

g

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