What goes around…︁ Cyclic mini-DNA duplexes, as shown in the scheme, have been synthesized in high yield on the multimicromole scale by using click chemistry. These B-like duplexes are very stable and bind to drugs, such as distamycin A and 7-aminoactinomycin D. Circular dichroism indicates that the bases are stacked, and UV melting and NMR spectroscopy showed that the interbase hydrogen bonds are very stable, even in a dimer.
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El‐Sagheer et al. (2007) studied this question.
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