Structure and conformation of a nucleoside analog 5-nitro-1-beta-D-arabinofuranosyluracil

C9H11N3O8, Mr = 271, orthorhombic, P2(1)2(1)2(1), a = 9.241 (2), b = 20.518 (4), c = 6.187 (1) A, V = 1173.1 A3, Z = 4, D chi = 1.29 g cm-3, Mo K alpha, lambda = 0.7107 A, mu = 1.57 cm-1, F(000) = 600, T = 288 K, final R = 0.051 for 1078 observed reflections. Conformational features of the nucleoside include a glycosidic bond conformation in the anti range, a ribose moiety in the C(2')-endo (2E) form and the C(5')-(5') bond gauche to both C(4')-O(4') and C(4')-C(3').