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the presence of the characteristic peak of methylene (C-H) was 1400 cm-1 and the presence of the characteristic peak of ester group is 1800 cm-1 in the infrared spectrograms,

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linghanyuan(½ð±Ò+1,VIP+0):лл½»Á÷ 11-7 14:55
the presence of the characteristic peak of methylene (C-H) was not only at 1400 cm-1 but also at 1800 cm-1 in the infrared spectrograms
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