You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
For the molecule named 14-(4-methoxyphenyl)-4,10,15-triazapentacyclo[9.8.0.02,9.05,8.012,17]nonadeca-1(11),2(9),12,14,16-pentaen-3-one by IUPAC nomenclature, provide its molecular formula.
user
C23H21N3O2
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