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# Structure of S-(p-Nitrobenzyl)-6-Thioguanosine

Mande, Sharmila S and Seshadri, TP and Viswamitra, MA (1988) Structure of S-(p-Nitrobenzyl)-6-Thioguanosine. In: Current Science, 57 (9). pp. 923-925.

The crystal structure of S-(p-nitrobenzy1)-6-thioguanosine has been determined. The crystal belongs to the monoclinic system with a = 7.299(1), b = 8.825(2), c = 14.565(1) \AA, \beta = 94.78(1)°. There is one molecule in the asymmetric unit. The structure is solved by direct methods and refined to an R-factor of 0.031. The molecule has syn guanosinc base, C(2')-endo sugar pucker and gauche-gauche conformation about the C(4')-C(5') bond. The torsion angle about S-C(9) bond bridging the base and the benzene ring is - 77.6(3)°. The crystal structure is stabilized by an N(3) ... O(5') intramolecular hydrogen bond in addition to several intermolecular hydrogen bonds. Although the crystal structure shows no base-base stacking, thc exocyclic atoms N(13) and O(1) of the phenyl ring show close stacking contacts with thc guanosine base of the $2_1$ related molecule.