[structure: see text] The 2'-OMe-A (2) and 3'-OMe-A (3) analogues of the calcium release agent cADPR (1) were prepared and their solution structures studied by NMR spectroscopy. Compared to 1, 2 shows a shift in its A ring conformation and changes in its R ring N:S and gammat:gamma+ ratios, while 3 displays a significant change in the conformation of its A ring gamma-bond.
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