You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
Can you give the molecular formula of the molecule 4-amino-1-[(2R,3R,4R,5R)-5-(chloromethyl)-5-ethyl-3-fluoro-4-methyloxolan-2-yl]pyrimidin-2-one ?
user
C12H17ClFN3O2
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