Abstract
The title compound, C 17 H 19 N 5 O 6 S, crystallizes from a water-acetone solution. The adenine base is in an anti conformation, with a glycosyl torsion angle of -166.5 (4)°. The ribose sugar adopts an envelope conformation ( 3 E). The toluenesulfonyl moiety is nearly perpendicular to the base. Both Watson-Crick and Hoogsteen sites, N1 and N6, and N6 and N7, of the adenine base are involved in a pair of hydrogen bonds, forming an A.A.A triplet pattern in the crystal lattice.
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