N-8-(2 `-O-methylribofuranosyl)-8-aza-7-deazaadenine monohydrate

Abstract

In the title compound, 4-amino-2-(2-O-methyl-beta-D-ribofuranosyl)-2H- pyrazolo[3,4-d] pyrimidine monohydrate, C11H15N5O4 center dot H2O, the conformation of the N-glycosylic bond is syn [chi = 20.1 (2) degrees]. The ribofuranose moiety shows a C3'-endo (T-3(2)) sugar puckering (N-type sugar), and the conformation at the exocyclic C4' - C5' bond is -ap ( trans). The nucleobases are stacked head-to-head. The three-dimensional packing of the crystal structure is stabilized by hydrogen bonds between the 2'-O-methylribonucleosides and the solvent molecules.