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 methyl 4-(3,3,7-trimethyl-4,11-dioxo-2-oxa-6-azatricyclo[7.3.1.05,13]trideca-1(12),5(13),7,9-tetraen-6-yl)butanoate is given. What is its corresponding molecular formula?
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C19H21NO5
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