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Top: Structures of the alloc (©3), and allyl (6) protected derivatives of bisbenzamidine 3. Bottom: fluorescence emission of 5 μM solutions of 3 and ©3 in Tris-HCl 20 mM, 100 mM NaCl, pH 7.5 (dashed lines), and in the presence of 1 equiv. of h-A3·T3 (solid lines). h-A3·T3: 5′-GGC-AAATTT-CAGTTTTTCTG-AAATTT-GCC-3′.
