Abstract
Recognition of DNA duplexes by triplex forming oligonucleotides (TFO) is limited to DNA homopurine sequences. As a first step to overcome this limitation we report here NMR recognition studies of the C·G base pair by new heterocyclic systems, derived from benzimidazole and benzoxazole units bearing an urea donor moiety, designed to bound to the 4-amino group of the cytosine and the O4- and N7-atoms of the guanosine bases, respectively.
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