You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
N-(2-benzoyl-4-chlorophenyl)-2-(2,6-dimethyl-3-oxo-1,4-benzoxazin-4-yl)acetamide is the IUPAC name of a molecule. Please give its molecular formula.
user
C25H21ClN2O4
assistant