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 (14R)-14-[4-(4-hydroxybut-1-ynyl)phenyl]-2,8,11-triazatricyclo[7.5.0.02,7]tetradeca-1(9),3,5,7-tetraen-12-one is given. What is its corresponding molecular formula?
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C21H19N3O2
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