You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
For the molecule named 4-chloro-3-methyl-N-[2-[5-(trifluoromethyl)pyridin-2-yl]sulfonylethyl]benzamide by IUPAC nomenclature, provide its molecular formula.
user
C16H14ClF3N2O3S
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