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. 2019 Jan 30;10:485. doi: 10.1038/s41467-019-08343-6

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© The Author(s) 2019

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. 2 — Crystallographic structures and packing of 2a and 2b. a, c Crystallographic structures of 2a and 2b with thermal ellipsoids at the 50% probability level. The bowl depths of 2a and 2b are indicated. b, d Packing structures of 2a in the a–c plane and 2b in the b–c plane. C atom is shown in gold and N atom in navy blue. All hydrogen atoms are omitted for clarity