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-(3-acetyloxypropoxy)ethyl-[3-[4-(2,4-dioxopentyl)phenyl]azanidyl-3-oxopropanoyl]azanide;rubidium(1+) is given. What is its corresponding molecular formula?
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C21H26N2O7Rb2
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