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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 3 — Structures of the obtained ribosides of 1,N⁶-etheno-isoguanine (4). R=β-d-ribosyl: (5) 1,N⁶-etheno-N9-β-d-ribosylisoguanosine; (6) 1,N⁶-etheno-N7-β-d-ribosylisoguanosine; 1,N⁶-etheno-N⁶-β-d-ribosylisoguanosine (7).