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The degree of introduction (DI) of the ethyl ester group of CRA was calculated to be 100% by 1HNMR integration of the signal for the aromatic protons at 6.25 ppm and methyl protons of the ethyl ester at 1.27 ppm.


aromatic(芳香) protons (质子)methyl(甲基)ethyl ester (乙酯)
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