You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
Translate the chemical IUPAC name 2-[[5-(4-methoxyphenyl)-1,3,4-oxadiazol-2-yl]sulfanyl]-N-naphthalen-2-ylacetamide into its molecular formula.
user
C21H17N3O3S
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