You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
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Under IUPAC nomenclature, a molecule named 3-[(4-benzylpiperidin-1-yl)-hydroxymethyl]-5H-benzo[b][1,4]benzothiazepin-6-one is given. What is its corresponding molecular formula?
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C26H26N2O2S
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