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. 2022 Jan 12;18:102–109. doi: 10.3762/bjoc.18.11

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Copyright © 2022, Bruzgulienė et al.

This is an open access article licensed under the terms of the Beilstein-Institut Open Access License Agreement (https://www.beilstein-journals.org/bjoc/terms/terms), which is identical to the Creative Commons Attribution 4.0 International License (https://creativecommons.org/licenses/by/4.0). The reuse of material under this license requires that the author(s), source and license are credited. Third-party material in this article could be subject to other licenses (typically indicated in the credit line), and in this case, users are required to obtain permission from the license holder to reuse the material.

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(a) ¹H NMR (italics), ¹³C NMR (normal), and ¹⁵N NMR (bold) chemical shifts (ppm) of compound 3a in CDCl₃; (b) ¹H NMR (italics), ¹³C NMR (normal), and ¹⁵N NMR (bold) chemical shifts (ppm) of compound 4a in CDCl₃; (c) relevant ¹H,¹³C HMBC, ¹H,¹⁵N HMBC and 1,1-ADEQUATE correlations of compound 4a.