You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
2-[3-[5-(4-ethoxyphenyl)-1,2,4-oxadiazol-3-yl]phenoxy]-1-pyrrolidin-1-ylethanone The above is the IUPAC name of a molecule. Write its molecular formula.
user
C22H23N3O4
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