You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
N-(1,5-dimethylpyrazol-3-yl)-2-(5-oxospiro[3H-1,4-benzoxazepine-2,4'-oxane]-4-yl)propanamide The above is the IUPAC name of a molecule. Write its molecular formula.
user
C21H26N4O4
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