The crystal and molecular structure of 2',3',5'-tri-<i>O</i>-acetyl-6-<i>O</i>-(mesitylenesulphonyl)guanosine

The structure of a 6-O-mesitylenesulphonyl derivative of 2',3',5'-tri-O-acetylguanosine, C 24 H 29 N50 10 S, has been determined by X-ray diffraction.Crystals are monoclinic, a = 26.370(4), b = 8.200 (2), c = 17.991 (3) A, fl = 132.77(4) o.The solution of the structure in space group C2 was not straightforward and is described in detail.Refinement converged at R = 0.110 for 1102 observed reflections.The guanine base displays some deviations from its usual geometry due to the loss of C(6)-O(6) double-bond character.The ribose sugar is C(2')-endo puckered.