Kartha G, Ambady G, Viswamitra M A
Science. 1973 Feb 2;179(4072):495-6. doi: 10.1126/science.179.4072.495.
Cytidylic acid "a" (cytidine 2'-monophosphate) crystallizes in the triclinic space group P1 with two molecules of cytidine monophosphate (C(9)H(14)O(8)N(3)P) and six molecules of water in the unit cell. X-ray analysis of this crystal shows that in both molecules, the base is in the anti conformation, the ribose ring is C(2')-endo puckered, and the hydroxyl O(5') is gauche-gauche. The two molecules are linked by a short hydrogen bond through the phosphate oxygens.
胞苷酸“a”（胞苷2'-单磷酸）在三斜晶系空间群P1中结晶，晶胞中有两个胞苷单磷酸（C₉H₁₄O₈N₃P）分子和六个水分子。对该晶体的X射线分析表明，在两个分子中，碱基均处于反式构象，核糖环呈C(2')-内型褶皱，且羟基O(5')呈邻位交叉-邻位交叉构象。这两个分子通过磷酸氧原子形成的短氢键相连。
