The conformational differences in the structure of methyl paraben at 118 K and room temperature would appear to be within normal changes because of lattice expansion. Therefore, they do not represent different polymorphs as proposed in a publication ( Vujovic, D.; Nassimbeni, L. R. Cryst. Growth Des.2006, 6, 1595–1597 ).
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Threlfall et al. (2007) studied this question.
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