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Parallel stranded (ps) duplexes were constructed by incorporating 7-deaza-2′-deoxyisoguanosine (1a) or its 7-halogenated analogs 1b,c in place of 2′-deoxyisoguanosine. UV and T m analyses prove the high affinity of ethidium bromide (EB) to these modified duplexes. Steady-state fluorescence measurement shows that the fluorescence is quenched when EB is bound to ps duplexes containing compounds...
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