You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
Translate the chemical IUPAC name 4-chloro-3-(furan-2-ylmethylsulfamoyl)-N-[(2-pyrazol-1-ylpyridin-4-yl)methyl]benzamide into its molecular formula.
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C21H18ClN5O4S
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