Abstract
Oxoformycin B, Ct0HI206N4, crystallizes in the orthorhombic space group P212121 with a = 7.756 (6), b= 21.313 (15), c= 6.831 (5) A, Z = 4, and formycin B, C10H12OsN4, in the monoclinic space group P21 with a = 13.493 (10), b=6.257 (6), c=6705 (5) A, ,8=99.71 (7) °, Z=2 . Both crystal structures were solved by the direct method and refined by the least-squares method to R values of 0.04 including H atoms. In oxoformycin B, the conformation of the C-glycosyl bond is syn with a Z angle of 164-1 ° and that of the ribofuranose group is C(Y)-endo with a gauche-gauche (gg) conformation about the C(4')-C(5') bond. The syn conformation is stabilized by the intramolecular hydrogen bond, N(3) -H. . .0 (5 ' ) . In formycin B, the corresponding conformations are anti, Z=304 °, C(2)-endoC( l')-exo and gg.
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