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. 2019 Apr 16;24(8):1493. doi: 10.3390/molecules24081493

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© 2019 by the authors.

Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (http://creativecommons.org/licenses/by/4.0/).

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Scheme 1 — Structures of the nucleobase analogs investigated in this work (from left to right): (1) 1,N²-ethenoguanine, (2) N²,3-ethenoguanine, (3) N²,3-etheno-O⁶-methylguanine, (4) 1,N⁶-ethenoisoguanine. Only one tautomeric form is given for simplicity. Note that the purine numbering is applied (except for the etheno-group atoms).