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system
Name the molecular formula for the molecule established as 2-chloro-N-[3-[2-[(2-hydroxy-3-nitrophenyl)methylidene]hydrazinyl]-3-oxo-1-thiophen-2-ylprop-1-en-2-yl]benzamide using the IUPAC nomenclature.
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C21H15ClN4O5S
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