You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
Translate the chemical IUPAC name [4-(benzenesulfonyl)-1,4-diazepan-1-yl]-(2-methyl-[1,2,4]triazolo[1,5-a]pyridin-6-yl)methanone into its molecular formula.
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C19H21N5O3S
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