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. 2020 Feb 28;8:142. doi: 10.3389/fchem.2020.00142

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Copyright © 2020 Yuan, Pei and Lai.

This is an open-access article distributed under the terms of the Creative Commons Attribution License (CC BY). The use, distribution or reproduction in other forums is permitted, provided the original author(s) and the copyright owner(s) are credited and that the original publication in this journal is cited, in accordance with accepted academic practice. No use, distribution or reproduction is permitted which does not comply with these terms.

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Symmetry in hydrogen mapping. (A) Example for the symmetry of structure. 2 C₂ symmetry axis of 1,4-dichlorobenzene conduce to 4 possible hydrogen mappings. (B) Example for the symmetry of group. A C₃ symmetry axis of methyl group of acetic acid conduces to three possible hydrogen mappings. The hydrogen atom colored in red and blue indicates the first hydrogen and last hydrogen in hydrogen mapping, respectively.