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The structure of racemic ibuprofen [α-methyl-4-(2-methylpropyl)benzeneacetic acid], C13H18O2, has been refined using single-crystal pulsed neutron diffraction data collected at 100 K. Accurate positional and anisotropic displacement (vibration) parameters have been determined for all 33 atoms and the hydrogen-bond geometry of the dimeric crystal-packing motif is well defined.
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Shankland et al. (1997) studied this question.
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