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. 2017 Aug 24;8:346. doi: 10.1038/s41467-017-00382-1

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© The Author(s) 2017

Open Access This article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as 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. The images or other third party material in this article are included in the article’s Creative Commons license, unless indicated otherwise in a credit line to the material. If material is not included in the article’s Creative Commons license and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder. To view a copy of this license, visit http://creativecommons.org/licenses/by/4.0/.

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Fig. 5 — Nucleus-independent chemical shift (NICS) scans of ^Th4 COT _Saddle and ^Th6 CDH _Screw. a, b, Top and side views of the inversion transition states of ^Th4 COT _Saddle (a) and ^Th6 CDH _Screw (b) in the S₀ and T₁ states. c, d, NICS_zz scans of ^Th4 COT _Saddle (c) and ^Th6 CDH _Screw (d), which start from the annulene ring center and scanned along the arrows shown in a and b. Black- and green-colored dots represent the scans in the S₀ and T₁ states, respectively