You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
Please write the molecular formula of the molecule 2-chloro-7-[(2R,3R,4S,5R)-3,4-dihydroxy-5-(hydroxymethyl)oxolan-2-yl]-4-methoxypyrrolo[2,3-d]pyrimidine-5-carbonitrile .
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C13H13ClN4O5
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