You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
(2S)-N-tert-butyl-2-[(2,4-dichlorophenyl)methyl-[2-[(2-methylphenyl)methylsulfanyl]acetyl]amino]butanamide is the IUPAC name of a molecule. Please give its molecular formula.
user
C25H32Cl2N2O2S
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