You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
4-[[(5Z)-5-[(2-methoxyphenyl)methylidene]-3-methyl-4-oxo-1,3-thiazolidin-2-ylidene]amino]benzoic acid is the IUPAC name of a molecule. Please give its molecular formula.
user
C19H16N2O4S
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