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-[(1S,2S,3S,4R)-2,3-dihydroxy-4-(3-hydroxy-4-methyl-2-oxopyrrolo[2,3-d]pyrimidin-7-yl)cyclopentyl]oxy-5-fluorophenyl] acetate .
user
C20H20FN3O7
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