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The planar double ring system of adenine is conformationally rigid. Rotations of the ribose ring of adenosine around the N-glycosidic bond are hindered by nonbonded electrostatic and steric forces. The flexibility of the sugar ring and the changed conformations of the substituents of 2-(N'-alkylidenehydrazino)- and 2-(N'-aralkylidenehydrazino)adenosine A 2 agonists may be observed under changing...
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