You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
Translate the chemical IUPAC name 4-chloro-N-[2-oxo-2-[3-([1,2,4]triazolo[4,3-a]pyridin-3-yl)piperidin-1-yl]ethyl]benzenesulfonamide into its molecular formula.
user
C19H20ClN5O3S
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