The synthesis and properties of a full set of four benzo-expanded ribonucleosides (xRNA), analogous to A, G, C, and U RNA monomers, are described. The nucleosides are efficient fluorophores with emission maxima of 369-411 nm. The compounds are expected to be useful as RNA pathway probes and as components of an unnatural ribopolymer.
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Hernández et al. (2011) studied this question.
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