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 5,6-diamino-2,11-diazapentacyclo[10.7.1.02,10.04,9.016,20]icosa-1(20),3,5,7,9,11,13,15,17-nonaen-19-one is given. What is its corresponding molecular formula?
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C18H12N4O
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