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 1-[(6R)-4-acetyl-6-hydroxy-6-(pyrazol-1-ylmethyl)-1,4-diazepan-1-yl]-2-(4-methoxyphenyl)ethanone is given. What is its corresponding molecular formula?
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C20H26N4O4
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