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Di(1,N 6 -ethenoadenosine) 5', 5 -P 1 , P 4 -tetraphosphate, ε-(Ap 4 A), a fluorescent analog of Ap 4 A has been synthesized by reaction of 2-chloroacetaldehyde with Ap 4 A. At neutral pH this Ap 4 A analog presents characteristic maxima at 265 and 274 nm, shoulders at ca 260 and 310 nm and moderate fluorescence (λ exc 307...
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