Figure 4.

A. Proton-decoupled ³¹P NMR of the 1,N²-εdG-modified oligodeoxynucleotide duplex. Labeled peaks, G⁷ and C¹⁹, were identified from their two dimensional H3′-³¹P spectrum where it showed cross peak for X⁶ H3′→G^{7 31}P, and C¹⁸ H3′→C^{19 31}P. The spectrum was recorded at 25 °C in 10 mM NaH₂PO4, 100 mM NaCl, and 5 μM Na₂EDTA (pH 8.6).