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Fundamental C = O stretching region of (A) MG and (B) MGD and the first overtone, 2ν8 and 2ν9, of (C) MG and (D) MGD showing a decrease in the relative intensity of ν9 in (B) when compared to (A) and a decrease in the 2ν8 and 2ν9 aldehydic peak in (D) when compared to (C).
