In spectrum A, we see four signals: a singlet at around 0.9 ppm, a doublet at around 1.3 ppm, a doublet at around 1.6 ppm, and a multiplet at around 2.3-2.4 ppm. In spectrum B, we see three signals: a singlet at around 0.9 ppm, a doublet at around 1.3 ppm, and a
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