You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
Convert the IUPAC name of a molecule (3S)-N-[(3-chlorophenyl)methyl]-1-(2-methylthieno[3,2-c]pyridin-4-yl)piperidine-3-carboxamide into molecular formula.
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C21H22ClN3OS
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