You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
Translate the chemical IUPAC name (1R,5S)-3-[3-(difluoromethoxy)phenyl]-3-azabicyclo[3.1.0]hexane;7-methyl-1-(1,2,4-oxadiazol-5-ylmethyl)purin-6-one into its molecular formula.
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C21H21F2N7O3
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