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. 2020 Dec 7;11:6259. doi: 10.1038/s41467-020-20101-7

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© The Author(s) 2020

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. 4 — a The single crystal structure of ZUL-200 under C₂H₂ (C₂H₂@ZUL-200) at ultralow pressure viewed along the c axis. C₂H₂ molecules are trapped in interlayer space with dual C–H···F hydrogen bonds (2.42 Å). b The single crystal structure of C₂H₂@ZUL-200 viewed along the a axis (Color code: F, teal; Nb, plain blue; C (in framework), gray; H, white; N, sky blue; S, yellow; O, red; Cu, blue; C (in C₂H₂), golden).