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Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (https://creativecommons.org/licenses/by/4.0/).
Three-dimensional plots of TSs_sec for compounds 1a and 1c, TSs2 for compound 1b, and the corresponding products P_sec. For TSs imaginary frequencies are shown as dotted lines and distances are reported in angstroms.