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. 2016 Sep 13;7:12711. doi: 10.1038/ncomms12711

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Copyright © 2016, The Author(s)

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The transformation proceeds from left to right (indicated by arrows). The reaction temperature for each transformation is shown. (a) Intact tDBA, which was not seen on Cu(111). (b) First product formed as deposited on a cold Cu(111). (c) Second product after annealing at 200°C. (d) Third product after annealing at 400°C. In the two middle structures the molecule contains 14 hydrogen atoms; in the first and last configurations these extra hydrogen atoms are placed on the copper surface (highlighted in red).