You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
N-[4-(3-anilino-6,6-dimethyl-4-oxo-5,7-dihydro-1H-indol-2-yl)pyridin-2-yl]propanamide is the IUPAC name of a molecule. Please give its molecular formula.
user
C24H26N4O2
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