You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
N-butyl-2-[(2,6-dichlorophenyl)methyl-[2-(3,5-dimethylphenyl)acetyl]amino]butanamide The above is the IUPAC name of a molecule. Write its molecular formula.
user
C25H32Cl2N2O2
assistant