You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
Under IUPAC nomenclature, a molecule named 2-[4-(2-methoxyphenyl)-6-oxopyrimidin-1-yl]-N-[3-(6-oxopyridazin-1-yl)propyl]acetamide is given. What is its corresponding molecular formula?
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C20H21N5O4
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