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. 2017 Dec 22;49(3):293–307. doi: 10.1007/s00723-017-0968-8

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© The Author(s) 2017

Open AccessThis article is distributed under the terms of the Creative Commons Attribution 4.0 International License (http://creativecommons.org/licenses/by/4.0/), which permits unrestricted use, distribution, and reproduction in any medium, provided you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made.

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Fig. 1 — Structures and atom numbering in the studied isotopomer of AB. trans-to-cis conversion is due to light excitation, $h ν$ ; the back cis-to-trans conversion is thermally activated or it results from light excitation $h ν^{'}$