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Proton chemical shift differences between the (P·F)-duplex and (P·F)-intermediate samples. (A) Real value differences among the aromatic pyrene protons [negative values correspond to a downfield position in the (P·F)-intermediate], and (B) absolute value differences of the major groove base and H2′ protons (black- and line-filled bars, respectively) and minor groove H1′ and H2″ protons (dot- and white-filled bars, respectively).
