A. Tomas, N. Dung, B. Viossat
Mar 15, 1993
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Influential Citations
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Citations
Journal
Acta Crystallographica Section C-crystal Structure Communications
Abstract
The structure of 5-methyl-2-[(2,3,4-tri-O-acetyl-β-D- arabinopyranosyl)thio]-3,4-dihydro-7H-pyrano[2,3- g]pyrimidine-4,7-dione, C 19 H 20 N 2 O 10 S, is described. This compound consists of a sugar ring and a planar base (pyranopyrimidine derivative) linked unusually by an S atom. The sugar ring is in a 4 C 1 chair conformation and makes dihedral angles of 74.5 (4) and 75.7 (4) o with the pyran and pyrimidine rings. The S atom occupies an axial position on the sugar ring and lies 2.461 (9) A out of the corresponding mean plane