volume 65, issue 12, Po645-o648 2009
DOI: 10.1107/s0108270109044850
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Abstract: The title compound, 1-(2-deoxy-beta-D-erythro-pentofuranosyl)-5-(prop-1-ynyl)pyrimidin-2,4(1H,3H)-dione, C(12)H(14)N(2)O(5), shows two conformations in the crystalline state: conformer 1 adopts a C2'-endo (close to (2)E; S-type) sugar pucker and an anti nucleobase orientation [chi = -134.04 (19) degrees], while conformer 2 shows an S sugar pucker (twisted C2'-endo-C3'-exo), which is accompanied by a different anti base orientation [chi = -162.79 (17) degrees]. Both molecules show a +sc (gauche, gauche) conform…

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