You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
2-[3-[(Z)-(3-benzyl-4-oxo-2-sulfanylidene-1,3-thiazolidin-5-ylidene)methyl]phenoxy]-N-(3,5-dichlorophenyl)acetamide is the IUPAC name of a molecule. Please give its molecular formula.
user
C25H18Cl2N2O3S2
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