You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
Translate the chemical IUPAC name N-[(1-chloropyrrolidin-3-yl)methyl]-6-oxo-5H-benzo[b][1,4]benzothiazepine-3-carboxamide into its molecular formula.
user
C19H18ClN3O2S
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