The crystal structure of thymidine (CIoN2OsH14) has been determined from data collected on a Hilger and Watts linear diffractometer and a Wooster four-circle diffractometer. Thymidine is orthorhombic, space group P2~2121, with the following cell dimensions: a= 4.860_ 0.005, b = 13.91 _+ 0.01 and c= 16.32 +_ 0.01/~. The structure was solved by a Patterson interpretation method and the positional and thermal parameters were refined by the method of least-squares. The carbon, nitrogen and oxygen atom thermal parameters were refined anisotropically. The final R value for the 1230 observed reflexions is 0.066 and the average standard deviations in the bond lengths and angles are about 0.006/~, and 0.4 ° respectively.
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