You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
N-[2-(4-fluorophenyl)ethyl]-2-[(2R)-2-(morpholine-4-carbonyl)-2,3-dihydro-1,4-benzoxazin-4-yl]acetamide is the IUPAC name of a molecule. Please give its molecular formula.
user
C23H26FN3O4
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