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- This fact is compatible with the presence of the ammonium ion inside the central hole [3]. The estimated volume of the cavity is about 30 Å−3 per tetramer and hence the local electronic density is about 0·33 eÅ−3. This value is roughly equal to that of water but considerably smaller than the average value for the guanosine derivative (0·47 eÅ−3).
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