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The crystal structure of methyl paraben was elucidated at 113K ( 1 ), while the structure at room temperature ( 2 ) has been determined previously (Lin, X. T. Chin. J. Struct. Chem. 1983, 2 (3), 213). There is a slight lengthening of the b axis in the low-temperature structure and twisting of the ester group resulting in small but statistically significant differences in the PXRD patterns between 1 and 2 . The phase transformation occurs gradually over the full temperature range (293−113 K).
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Vujovic et al. (2006) studied this question.
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