You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
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Convert the IUPAC name of a molecule 7-[(3S)-3-methyloxan-4-yl]-2-[[1-methyl-3-(oxetan-3-yloxy)pyrazol-4-yl]amino]pyrrolo[2,3-d]pyrimidine-6-carbonitrile into molecular formula.
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C20H23N7O3
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