You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
4-chloro-N-[5-[2-[(2Z)-2-[(2-hydroxy-3-methoxyphenyl)methylidene]hydrazinyl]-2-oxoethyl]-1,3,4-thiadiazol-2-yl]benzamide is the IUPAC name of a molecule. Please give its molecular formula.
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C19H16ClN5O4S
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