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1H NMR spectra of the formation of a mixed anhydride (δ=−7.9 ppm) and of 2’,3’‐cAMP (δ=16.1 ppm) in [D7]DMF (From top to bottom, 10 min, 24 h, 48 h) as a result of the reaction of 25 mm oxazolone 1 with 5 mm 3’‐AMP in the presence of 5 mm DIEA at room temperature.
