Figure 3
Comparison of the geometry of all the 3′:5′-cyclic nucleotides in this report with the nucleobase in the syn orientation [anions and/or zwitterions of cAMP, cGMP and cIMP of (I)–(V) and deposited in the CSD]. Most of the H atoms have been omitted for clarity. Intramolecular C—H⋯N hydrogen bonds are shown with dashed lines. The common reference points are the O4′, C1′ and C2′ atoms. (The legend indicates the order of increasing χCN.) |