You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
Please write the molecular formula of the molecule (5Z)-5-[[3-[(2,4-dichlorophenyl)methoxy]phenyl]methylidene]-3-propyl-2-sulfanylidene-1,3-thiazolidin-4-one .
user
C20H17Cl2NO2S2
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