You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
methyl (2R)-2-[(5E)-5-[(3-methylphenyl)methylidene]-2,4-dioxo-1,3-thiazolidin-3-yl]propanoate is the IUPAC name of a molecule. Please give its molecular formula.
user
C15H15NO4S
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