You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
Provide the molecular formula for the IUPAC named substance methyl 4-[(Z)-[3-[(4-methylphenyl)methyl]-4-oxo-2-sulfanylidene-1,3-thiazolidin-5-ylidene]methyl]benzoate .
user
C20H17NO3S2
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