We synthesized oligodeoxynucleotide (ODN, 3) containing 2-N-tert-butylaminoxyladenosine (1) and studied EPR spectra of 1 and its duplexes with varied sequences. Duplex formation resulted in a broadening of spectrum and a significant decrease in peak-to-peak height and peak height ratio values. The h(+)/ho values in EPR spectra well correlated with stability of duplex which indicated ODN containing 1 has the potential to monitor DNA structure.
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