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A 13mer DNA duplex containing the artificial 4‐aminophthalimide:2,4‐diaminopyrimidine (4AP:DAP) base pair in the central position was characterized by optical and NMR spectroscopy. The fluorescence of 4AP in the duplex has a large Stokes shift of Δλ=124 nm and a quantum yield of ΦF=24 %. The NMR structure shows that two interstrand hydrogen bonds are formed and confirms the artificial base pairing...
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