You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
Translate the chemical IUPAC name 1-cyclopropyl-6-methyl-4-[1-[2-(3-methylphenyl)acetyl]azetidin-3-yl]oxypyridin-2-one into its molecular formula.
user
C21H24N2O3
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