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 (3S,4R,5R)-2-[1-(4-chlorophenyl)-1-hydroxyethyl]-5-[4-(ethoxyamino)pyrrolo[2,3-d]pyrimidin-7-yl]oxolane-3,4-diol .
user
C20H23ClN4O5
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