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-(cyclopenten-1-yl)-1-[(1R,9R)-8-oxa-2,3,4,12-tetrazatricyclo[7.4.0.02,6]trideca-3,5-dien-12-yl]ethanone is given. What is its corresponding molecular formula?
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C15H20N4O2
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