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. 2021 May 10;4:58. doi: 10.1038/s42004-021-00496-0

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© The Author(s) 2021

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 — a CD spectra of 1:1 d-α/d-sulfono-γ-AA hybrids 9 and 10 (100 μM) measured at room temperature in CH₃OH, foldamer 8 was included as a mirror comparison. b Single-crystal structures of left-handed helix formed by d-15-mer 9. Single-crystal structures of right-handed helix formed by l-15-mer 8 was employed as a mirror comparison. c Single-crystal structures of left-handed helix formed by d-17-mer 10. The nonpolar hydrogens were omitted for clarity. Solvent molecules were also excluded from the crystal lattice.