Acta Crystallographica Section C

Crystal Structure Communications

Volume 60, Part 1 (January 2004)

Acta Cryst. (2004). C60, o94-o97    [doi:10.1107/S0108270103026556]

Regioisomeric 4-nitroindazole N¹- and N²-(-D-ribonucleosides)

F. Seela, X.-H. Peng, H. Eickmeier and H. Reuter

Abstract: The structures of the isomeric nucleosides 4-nitro-1-(-D-ribofuranosyl)-1H-indazole, C₁₂H₁₃N₃O₆, (I), and 4-nitro-2-(-D-ribofuranosyl)-2H-indazole, C₁₂H₁₃N₃O₆, (II), have been determined. For compound (I), the conformation of the glycosylic bond is anti [ = -93.6  (6)°] and the sugar puckering is C2'-exo-C3'-endo. Compound (II) shows two conformations in the crystalline state which differ mainly in the sugar pucker; type 1 adopts the C2'-endo-C3'-exo sugar puckering associated with a syn base orientation [ = 43.7  (6)°] and type 2 shows C2'-exo-C3'-endo sugar puckering accompanied by a somewhat different syn base orientation [ = 13.8  (6)°].

Formula: Two regioisomers of C₁₂H₁₃N₃O₆

Online 20 December 2003

	Structure factor file (CIF format) (98.4 kbytes) Contains datablock I
	Structure factor file (CIF format) (185.3 kbytes) Contains datablock II

To open or display or play some files, you may need to set your browser up to use the appropriate software. See the full list of file types for an explanation of the different file types and their related mime types and, where available links to sites from where the appropriate software may be obtained.

The download button will force most browsers to prompt for a file name to store the data on your hard disk.

Where possible, images are represented by thumbnails.

Copyright © International Union of Crystallography
IUCr Webmaster