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. 2021 Feb 16;11:3869. doi: 10.1038/s41598-021-83474-9

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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 licence, and indicate if changes were made. The images or other third party material in this article are included in the article's Creative Commons licence, unless indicated otherwise in a credit line to the material. If material is not included in the article's Creative Commons licence 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 licence, visit http://creativecommons.org/licenses/by/4.0/.

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Imino proton region of (a) 1D NMR titration spectra of d(TTAGGGT)₄ with 1 at 25 °C at different R = [drug]/[DNA] ratios; (b) expanded region of 2D NOESY spectrum of 1/ d(TTAGGGT)₄ complex at R = 2.0. The boxes display the intermolecular NOE interaction of NH imino protons with pyrrole moiety and aromatic protons of 1.