You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
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For the molecule named 15,15-dimethyl-12-(4-triphenylen-2-ylphenyl)-24-oxa-12-azaheptacyclo[14.11.0.02,14.05,13.06,11.017,25.018,23]heptacosa-1(16),2(14),3,5(13),6,8,10,17(25),18,20,22,26-dodecaene by IUPAC nomenclature, provide its molecular formula.
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C51H33NO
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