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 2-[(3S)-4-(1H-benzimidazol-2-ylmethyl)morpholin-3-yl]-1-thiomorpholin-4-ylethanone is given. What is its corresponding molecular formula?
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C18H24N4O2S
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